Answer:
0.0488%
Step-by-step explanation:
Here we have the probability of different independent events, which means that none of the previous ones affect the next. For this kind of events, the probability 'P' that a series of events occur is the multiplication of the probability of each singular event.
p1: Probability that an H be obtained: 50% (is always 50% because it is independent of the previous results)
P: The probability that H be obtained all of the 10 times. This is the complementary probability to E:(a T comes up at least once).
By the first definition given
[tex]P=0.5^{11}=0.00048828=0.0488%[/tex]
The complementary probability 'P' is the probability that 'E' does not happen, so the probability that E happen is: [tex]P_{E} =1-P[/tex]
The last makes sense if we think about the fact that for the experiment there are just two possibilities, 'E' happen, or 'E' does not happen. Then,
[tex]P_{E} =1-0.000488=99.95[/tex]%
A market research firm conducts telephone surveys with a 41% historical response rate. a. What is the probability that in a new sample of 400 telephone numbers, at least 135 individuals will cooperate and respond to the questions? In other words, what is the probability that the sample proportion will be at least 135/400 = 0.3375?
Answer:
probability is 0.778
Step-by-step explanation:
Given data in question
success of probability (p) = 41% = 0.41
no of sample (n) = 400
individual = 150
to find out
probability that the sample proportion will be at least 135/400
solution
first we calculate the mean i.e
mean = p × n
mean = 400 × 0.41
mean = 164
now we calculate standard deviation = [tex]\sqrt{400(0.41) 0.59}[/tex]
standard deviation = 9.83666
we know P(X ≥ 135) = P(Z ≥ (150 - 164)/9.83666)
P(X ≥ 135) = P(Z ≥ (-1.42324)
from table 1 find corresponding probability
P(X ≥ 135) = 1 - P(Z ≥ (-1.42324)
= 1 - 0.9222 = 0.778
probability is 0.778
The waiting times between a subway departure schedule and the arrival of a passenger are uniformly distributed between 0 and 6 minutes. Find the probability that a randomly selected passenger has a waiting time greater than 2.25 minutes. Find the probability that a randomly selected passenger has a waiting time greater than 2.25 minutes.
Answer: 0.375
Step-by-step explanation:
The given interval : (0,6) [in minutes]
Let X represents the waiting time of a passenger.
We know that the cumulative uniform distribution function for interval (a,b) is given by :_
[tex]F(x)=\begin{cases}0,&\text{ for } x<a\\\frac{x-a}{b-a},& \text{for } a\leq x\leq 1\\1,& \text{for }x>b\end{cases}[/tex]
Then , the probability that a randomly selected passenger has a waiting time greater than 2.25 minutes. is given by :_
[tex]P(2.25<x)=\dfrac{2.25-0}{6-0}=0.375[/tex]
Hence, the required probability : 0.375
Answer:
Step-by-step explanation:
the answer is 0.625 reason is the probability is 62.5% and when you take
(6-2.25)/(6-0)
= (3.75)/(6)
=0.625
Convert the binary expansion of each of the following integers to a decimal expansion The decimal expansion of (1 1001)_2 is
[tex]1\cdot2^4+1\cdot2^3+1\cdot 2^0=16+8+1=25[/tex]
[tex]11001_2=25_{10}[/tex]
Final answer:
To convert (11001)_2 to decimal, multiply each binary digit by the corresponding power of 2 based on its position, starting from the right. Add the products to get the decimal value, which in this case is 25.
Explanation:
To convert the binary number (11001)_2 to its decimal equivalent, you must understand that each digit represents a power of 2, starting from the rightmost digit which is the least significant bit (LSB). The leftmost digit is the most significant bit (MSB). Now, let's convert (11001)_2 to decimal:
The rightmost digit (1) is in the 20 place, so it is worth 1*20 = 1.
The next digit to the left (0) is in the 21 place, so it is worth 0*21 = 0.
Continuing to the left, the next digit (0) is in the 22 place, so it's worth 0*22 = 0.
The next digit (1) is in the 23 place, so it's worth 1*23 = 8.
Finally, the leftmost digit (1) is in the 24 place, so it's worth 1*24 = 16.
Add up all the values: 16+0+0+8+1 = 25. So, the decimal expansion of (11001)_2 is 25.
Find the remainder when a is divided by m
a = 207^321 + 689! ; m=7
Answer with explanation:
⇒689!=689×688×687×686×........×7×6×5×4×3×2×1
So, 689! is divisible by 7.
We have to find the remainder when,
[tex]\frac{a}{m}=\frac{207^{321}+689!}{7}\\\\=\frac{207^{321}}{7}+\frac{689!}{7}\\\\=\frac{(210-3)^{321}}{7}+0\\\\=\frac{_{0}^{321}\textrm{C}\times (210)^{321}\times (3)^{0} -_{1}^{321}\textrm{C}\times (210)^{320}\times (3)^{1}+_{2}^{321}\textrm{C}\times (210)^{319}\times (3)^{2}-----(-1)\times _{321}^{321}\textrm{C}\times (321)^{0}\times (3)^{321}}{7}\\\\ \text{As ,210 is divisible by 7}\\\\=\frac{ (3)^{321}}{7}[/tex]
⇒[tex]3^7[/tex] ,when divided by 7, gives remainder 3.
[tex]\frac{ (3)^{321}}{7}=\frac{ (3)^{45\times 7+6}}{7}\\\\=3+\frac{3^6}{7}\\\\=3+1\\\\=4[/tex]
So,Remainder when
[tex]\frac{207^{321}+689!}{7}[/tex] is 4.
A round trip takes 3.5 hours going one way and 2 hours to return, if the trip back is at a speed 15 mph faster than the speed of the first trip. Find the speeds each way and the distance between the places.
Answer:
first trip 20 mph, trip back 35 mph, distance = 70 miles.
Step-by-step explanation:
A round trip takes 3.5 hours going one way and 2 hour to return.
Let the speed of first trip = v mph
Given that the trip back is at a speed 15 mph faster than the speed of first trip.
Therefore, the speed of trip back = ( v+15 ) mph
Let the Distance between places = d miles
Now we use the formula
[tex]Time=\frac{Distance}{Velocity}[/tex]
[tex]\frac{Distance}{Velocity}[/tex] = 3.5
and [tex]\frac{D}{V+15}[/tex] = 2
dividing these two
[tex]\frac{v+15}{v}[/tex] = [tex]\frac{3.5}{2}[/tex]
2v + 30 = 3.5v
v = 20 mph
d = 3.5 × 20 = 70 miles
The speed of the first trip is 20 mph and the speed of trip back (20+15) 35 mph. and the distance is 70 miles.
A and B and n x n matrices such that AB = 0. Prove that if A is invertible then B is not invertible.
Answer and Step-by-step explanation:
Since we have given that
AB = 0
where A and B are n x n matrices.
Consider determinant on both sides,
[tex]\mid AB\mid=\mid 0\mid\\\\\mid A\mid \mid B\mid =0\\\\either\ \mid A\mid =0\ or\ \mid B\mid =0[/tex]
since A is invertible, then |A| ≠ 0
so, it means |B| = 0.
Hence, B is not invertible.
Hence proved.
(1 pt) In a study of red/green color blindness, 950 men and 2050 women are randomly selected and tested. Among the men, 89 have red/green color blindness. Among the women, 6 have red/green color blindness. Construct the 99% confidence interval for the difference between the color blindness rates of men and women.
Answer: (0.066,0.116)
Step-by-step explanation:
The confidence interval for proportion is given by :-
[tex]p_1-p_2\pm z_{\alpha/2}\sqrt{\dfrac{p_1(1-p_1)}{n_1}+\dfrac{p_2(1-p_2)}{n_2}}[/tex]
Given : The proportion of men have red/green color blindness = [tex]p_1=\dfrac{89}{950}\approx0.094[/tex]
The proportion of women have red/green color blindness = [tex]p_2=\dfrac{6}{2050}\approx0.003[/tex]
Significance level : [tex]\alpha=1-0.99=0.01[/tex]
Critical value : [tex]z_{\alpha/2}=z_{0.005}=\pm2.576[/tex]
Now, the 99% confidence interval for the difference between the color blindness rates of men and women will be:-
[tex](0.094-0.003)\pm (2.576)\sqrt{\dfrac{0.094(1-0.094)}{950}+\dfrac{0.003(1-0.003)}{2050}}\approx0.091\pm 0.025\\\\=(0.09-0.025,0.09+0.025)=(0.066,\ 0.116)[/tex]
Hence, the 99% confidence interval for the difference between the color blindness rates of men and women= (0.066,0.116)
Convert 185 to base three
Answer:
20212
Step-by-step explanation:
Divide 185 by [tex]3^4[/tex] as [tex]3^4[/tex] is closest to 185
After dividing we get remainder 23 and quotient 2
Divide the remainder 23 by [tex]3^3[/tex] we get remainder 23 and quotient 0
Divide the remainder 23 by [tex]3^2[/tex] we get remainder 5 and quotient 2
Divide the remainder 5 by [tex]3^1[/tex] we get remainder 2 and quotient 1
Divide the remainder 2 by [tex]3^0[/tex] we get remainder 0 and quotient 2
Taking all the quotient values we get 20212
Hence, 185₁₀=20212₃
The given values are discrete. Use the continuity correction and describe the region of the normal distribution that corresponds to the indicated probability. The probability of exactly 44 green marbles A. The area between 43.5 and 44.5 B. The area between 43.5 and 45.5 C. The area between 44 and 44.5 D. The area between 43.5 and 44
Answer:
The correct option is A.
Step-by-step explanation:
It is given that the probability of exactly 44 green marbles.
We need to use the continuity correction and describe the region of the normal distribution that corresponds to the indicated probability.
A continuity correction is an adjustment that is made when a discrete distribution is approximated by a continuous distribution.
For example: In discrete x=7, then in continuous 6.5<x<7.5. It means we need to subtract 0.5 in the number to find the lower limit and we need to add 0.5 in the given number to find the upper limit.
Similarly,
In discrete x=44, then in continuous
44-0.5<x<44+0.5
43.5<x<44.5
The area between 43.5 and 44.5. Therefore the correct option is A.
The time between unplanned shutdowns of a power plant has an exponential distribution with a mean of 30 days. Find the probability that the time between two unplanned shutdowns is between 18 and 24 days.
The probability that the time between two unplanned shutdowns of a power plant is between 18 and 24 days, following an exponential distribution with a mean of 30 days, is approximately 0.0033.
For an exponential distribution, the probability density function (PDF) is given by:
[tex]\[ f(x) = \lambda e^{-\lambda x} \][/tex]
where [tex]\( \lambda \)[/tex] is the rate parameter, and for an exponential distribution, [tex]\( \lambda = \frac{1}{\text{mean}} \)[/tex].
Given a mean of 30 days, [tex]\( \lambda = \frac{1}{30} \)[/tex].
Now, to find the probability that the time between two unplanned shutdowns is between 18 and 24 days, integrate the PDF over this interval:
[tex]\[ P(18 < X < 24) = \int_{18}^{24} \lambda e^{-\lambda x} \, dx \]\[ P(18 < X < 24) = \int_{18}^{24} \frac{1}{30} e^{-\frac{x}{30}} \, dx \][/tex]
Let's complete the calculations step by step.
[tex]\[ P(18 < X < 24) = \int_{18}^{24} \frac{1}{30} e^{-\frac{x}{30}} \, dx \]\[ P(18 < X < 24) = -\frac{1}{30}e^{-\frac{x}{30}} \Big|_{18}^{24} \][/tex]
Now, evaluate the integral at the upper and lower limits:
[tex]\[ P(18 < X < 24) = -\frac{1}{30} \left(e^{-\frac{24}{30}} - e^{-\frac{18}{30}}\right) \]\[ P(18 < X < 24) = -\frac{1}{30} \left(e^{-0.8} - e^{-0.6}\right) \][/tex]
Using a calculator:
[tex]\[ P(18 < X < 24) \approx -\frac{1}{30} \left(0.44933 - 0.54881\right) \]\[ P(18 < X < 24) \approx -\frac{1}{30} \times (-0.09948) \]\[ P(18 < X < 24) \approx 0.003316 \][/tex]
Therefore, the probability that the time between two unplanned shutdowns is between 18 and 24 days is approximately 0.0033 (rounded to four decimal places).
A coin is tossed four times What is the probability of getting four heads? (1 mark) a) b) What is the probability of getting exactly work. (2 marks) two heads? Be sure to show your What is the probability of not getting two heads? Be sure to show your work.
1. A coin is tossed four times. What is the probability of getting four heads?
Each toss has a 1/2 chance of getting a head.
So the chance of getting all four heads can be calculated as :
[tex]1/2\times1/2\times1/2\times1/2=1/16[/tex]
2. A coin is tossed four times. What is the probability of getting two heads?
Each toss can have 2 results, so 4 flips will have [tex]2^{4}[/tex] or 16 results.
Getting two heads means getting two tails also. So, we can get the number of times two heads come = [tex]\frac{4!}{2!2!}[/tex] = 6
We can write the groups like - {HHTT,HTHT,HTTH,THHT,THTH,TTHH}
So, the required probability is : 6/16 or 3/8.
3. Not getting two heads means getting 3 tails and 1 head or all tails.
Probability of having all tails = [tex]1/2\times1/2\times1/2\times1/2=1/16[/tex]
Probability of one head(1st trial) and three tails = 1/16
Probability of one head (2nd trial) and three tails (the 1st, 3rd and 4th trials) = 1/16
Probability of one head (3rd trial) and three tails (the 1st, 2nd and 4th trials) = 1/16
Probability of one head (4th trial) and three tails (the 1st, 2nd and 3rd trials) = 1/16
So, the total probability showing only one or none head and at least three tails = [tex]1/16+1/16+1/16+1/16+1/16=5/16[/tex]
Four hundred people were asked whether gun laws should be more stringent. Three hundred said "yes," and 100 said "no". The point estimate of the proportion in the population who will respond "yes" is
Answer:
0.75
Step-by-step explanation:
We have been given that 400 people were asked whether gun laws should be more stringent. 300 hundred said "yes," and 100 said "no".
To find the point estimate of the proportion in the population who will respond "yes", we need to divide number of people who said yes by total number of people that is 300 by 400.
[tex]\text{People who will respond yes}=\frac{300}{400}[/tex]
[tex]\text{People who will respond yes}=\frac{3}{4}[/tex]
[tex]\text{People who will respond yes}=0.75[/tex]
Therefore, the point estimate of the proportion in the population who will respond "yes" is 0.75.
Problem Page
A ball is thrown vertically upward. After t seconds, its height h (in feet) is given by the function h(t) = 120t - 16t^2 . After how long will it reach its maximum height?
Do not round your answer.
Answer: After 3.75 seconds
Step-by-step explanation:
For a Quadratic function in the form [tex]f(x)=ax^2+bx+c[/tex], if [tex]a<0[/tex] then the parabola opens downward.
Rewriting the given function as:
[tex]h(t) = - 16t^2+120t[/tex]
You can identify that [tex]a=-16[/tex]
Since [tex]a<0[/tex] the the parabola opens downward.
Therefore, we can conclude that the x-coordinate of the vertex is the time in seconds in which the ball will reach the maximum height. You can find it with this formula:
[tex]t=\frac{-b}{2a}[/tex]
Substitute values, we get
[tex]t=\frac{-120}{2(-16)}=3.75\ seconds[/tex]
Final answer:
The time at which the ball reaches its maximum height is calculated using the vertex formula for a quadratic equation. In this case, the ball achieves maximum height after 3.75 seconds.
Explanation:
The function given is a quadratic equation in the form h(t) = 120t - 16t2, representing the height of a ball thrown vertically upward after t seconds. To find the time when the ball reaches its maximum height, we need to determine the vertex of the parabola represented by this equation.
The standard form of a quadratic equation is ax2 + bx + c. In this form, the time to reach the maximum height occurs at t = -b/(2a). Applying this to our equation, where a = -16 and b = 120, we calculate t = -120/(2*(-16)) = 120/32 = 3.75 seconds. Therefore, the ball reaches its maximum height after 3.75 seconds.
Elyria Warehousing desired to locate a central warehouse to serve five Ohio markets. Placed on a grid system, its five markets had coordinates and demand as shown below.
Location Coordinates (miles)
Demand (units)
(45, 65)
2,200
(120, 55)
900
(160, 95)
1,300
(100, 200)
1,750
(195, 175)
3,100
Calculate the Y-coordinate of the center-of-gravity location using the center-of-gravity technique.
69 miles
131 miles
53 miles
197 miles
171 miles
Answer:
The correct option is 2.
Step-by-step explanation:
According to the the center-of-gravity technique, the coordinates of the center-of-gravity location are
[tex](\frac{\sum x_iL_i}{\sum L_i},\frac{\sum y_iL_i}{\sum L_i})[/tex]
Where ([tex](x_i,y_i)[/tex] represent the coordinates and [tex]L_i[/tex] is demand.
We have to find the Y-coordinate of the center-of-gravity location.
The sum of product of demand and corresponding y coordinates is
[tex]\sum y_iL_i=65\times 2200+55\times 900+95\times 1300+200\times 1750+175\times 3100=1208500[/tex]
The sum of demanded units is
[tex]\sum L_i=2200+900+1300+1750+3100=9250[/tex]
The Y-coordinate of the center-of-gravity location is
[tex]y_0=\frac{\sum y_iL_i}{\sum L_i}[/tex]
[tex]y_0=\frac{1208500}{9250}[/tex]
[tex]y_0=130.6486[/tex]
[tex]y_0\approx 131[/tex]
The Y-coordinate of the center-of-gravity location is 131. Therefore the correct option is 2.
The center-of-gravity Y-coordinate is calculated by summing the product of the Y-coordinates and their respective demands, then dividing by the sum of all demands. The Y-coordinate of the center-of-gravity location is approximately 131 miles.
Explanation:The center-of-gravity location is calculated by using a specific formula: (Sum of (Demand * Y-coordinate) /Sum of Demand). Let's use the Y-coordinates given and their corresponding demands.
It would look like this:
((2200*65) + (900*55) + (1300*95) + (1750*200) + (3100*175)) / (2200+900+1300+1750+3100)
Do the math to find out the Y-coordinate:
143,000 + 49,500 + 123,500 + 350,000 + 542,500 = 1,208,500
2200+900+1300+1750+3100 = 9250
1,208,500/9250 = 130.59
So the Y-coordinate of the center-of-gravity location is approximately 131 miles.
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there are 6 sets of coins on the table. There is only one coin in the first set, 2 coins in the second set, 3 coins in the third set, 4 coins in the fourth set, 5 coins in the fifth set, and 6 coins in the sixth set. In each step, it is possible to add a coin to any two sets. Is it possible that after some steps the number of coins in each of the sets will be equal
if you answer correctly in first 10 minutes ill give brainliest
Answer:
no
Step-by-step explanation:
The total number of coins in all sets is 21, an odd number. In order for there to be equal numbers in all sets, the total number of coins must be even. Each step adds an even number of coins, so there is no number of steps that will add an odd number of coins to make the total be even.
A recent article in a college newspaper stated that college students get an average of 5.5 hrs of sleep each night. A student who was skeptical about this value decided to conduct a survey by randomly sampling 25 students. On average, the sampled students slept 6.25 hours per night. Identify which value represents the sample mean and which value represents the claimed population mean.
Answer: Population mean = [tex]\mu=5.5[/tex]
Sample mean = [tex]\overline{x}=6.25[/tex]
Step-by-step explanation:
We know that the population mean [tex]\mu[/tex] is the average of the entire population.
The sample mean [tex]\overline{x}[/tex] is the mean of the sample which is derived from the whole population randomly.
Given : A recent article in a college newspaper stated that college students get an average of 5.5 hrs of sleep each night.
Thus , the population mean = 5.5 hrs
Also, On average, the sampled students slept 6.25 hours per night.
It implies , the sample mean = 6.25 hours
Final answer:
The sample mean is 6.25 hours of sleep per night from the student's survey of 25 students, while the claimed population mean is 5.5 hours as stated in the college newspaper article.
Explanation:
In this scenario, the sample mean is the average amount of sleep that the 25 randomly sampled students reported, which is 6.25 hours per night.
The claimed population mean is the value mentioned in the college newspaper article, stating that college students get an average of 5.5 hours of sleep each night.
The sample mean represents the average found from the sample taken by the student, while the claimed population mean represents the average that is supposedly true for the entire population of college students.
What is the equation of the line that is tangent to the circle of radius 8 at (0,-8) and whose center is at the origin? Click to select your answer 2 3 4
Answer:
y=-8
Step-by-step explanation:
So if you draw a circle with center at the origin (0,0) with radius 8.
So we have:
That means the radius stretches to (0,-8); down 8 units from (0,0).
The radius stretches to (0,8); up 8 units from (0,0).
The radius stretches to (8,0); right 8 units from (0,0).
The radius stretches to (-8,0); left 8 units from (0,0).
We are looking for a line tangent to our circle at (0,-8). Since this was down 8 units. Then our equation is horizontal and y=a number. They-coordinate in (0,-8) is -8, so the we have y=-8.
If someone said tangent at (0,8), we would have said y=8 .
If someone said tangent at (8,0), we would have said x=8.
If someone said tangent at (-8,0), we have have said x=-8.
The equation of the line that is tangent to the circle with radius 8 at (0,-8) and center at the origin is y=-8. This is because the tangent line is horizontal at that point as it is perpendicular to the radius line lying along the y-axis.
Explanation:In the context of Mathematics, particularly geometry, the line that is tangent to a circle at a given point is perpendicular to the radius drawn to that point. Since the circle's center is at the origin (0,0) and the radius is extended to the point (0,-8), this radius lies along the y-axis. Therefore, the equation of the tangent line which is perpendicular to this radius would be a horizontal line through the point (0,-8), given by the equation y=-8.
Remember that tangent line by definition touches the circle at only one point without intersecting it and the line is perpendicular to the radius at that point of tangency. In this particular scenario, the radius and tangent are perpendicular lines in the coordinate system: the radius aligns with the y-axis, hence the tangent aligns with the x-axis.
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Solve x'=5t(sqrt(x)) x(0)=1
Answer:
[tex]2\sqrt{x}=\frac{5t^2}{2}+2[/tex]
Step-by-step explanation:
Given: [tex]\frac{\mathrm{d} x}{\mathrm{d} t}=5t\sqrt{x}\,,\, x(0)=1[/tex]
Solution:
A differential equation is said to be separable if it can be written separately as functions of two variables.
Given equation is separable.
We can write this equation as follows:
[tex]\frac{dx}{\sqrt{x}}=5t\,dt[/tex]
On integrating both sides, we get
[tex]\int \frac{dx}{\sqrt{x}}=\int 5t\,dt[/tex]
Formulae Used:
[tex]\int \frac{1}{\sqrt{x}}=2\sqrt{x}\,\,,\,\,\int t\,dt=\frac{t^2}{2}[/tex]
So, we get solution as [tex]2\sqrt{x}=\frac{5t^2}{2}+C[/tex]
Applying condition: x(0) = 1, we get [tex]C=2[/tex]
Therefore, [tex]2\sqrt{x}=\frac{5t^2}{2}+2[/tex]
Analyze the diagram below and complete the instructions that follow.
Find the value of x and the value of y.
A. x=4, y=8
B. x=7 , y=4√2
C. x=4√3 , y= 7√2
D. x=7√3 , y=4√2
Answer:
D. x=7√3 , y=4√2
Step-by-step explanation:
Step 1: Lets assume an imaginary line from A to B to make the triangle ABC( (refer to the attached image).
AB = 4
BD = 3
Step 2: Find the value of y by the sin formula.
opposite = 4
adjacent = BC
hypotenuse = AC
sin (angle) = opposite/hypotenuse
sin (45) = 4/AC
√2/2 = 4/AC
AC = y = 4√2
Step 3: Find the value of x
Tan (45) = opposite/adjacent
1 = 4/CB
CB = 4
x = CB + BD
x = 4 + 3
x = 7
Therefore, the answer is D where x = 7 and y = 4√2
!!
Find the equation of the line passing through (4, 3) and (-2, -7): A. 3x + 5y = 27 B. 3x - 5y = -3 C. 5x - 3y = 11 D. 2x - y = 5
Answer:
(c) 5x - 3y = 11
Step-by-step explanation:
using slope intercept form
we know equation of line is
y= mx+c........(1)
where m is slope which can be written as [tex]\frac{y_2-y_1}{x_2-x_1}[/tex]
[tex]m=\frac{-7-3}{-2-4} =\frac{-10}{-6} =\frac{5}{3}[/tex]
substituting value in equation (1)
[tex]y=\frac{5}{3} x+c[/tex]
now inserting value of point (4,3)
[tex]3=\frac{5}{3}\times 4+c[/tex]
[tex]c=\frac{-11}{3}[/tex]
[tex]y=\frac{5}{3} \times x-\frac{11}{3}\\[/tex]
on solving we get
[tex]5x - 3y = 11[/tex]
Which philosophical assumptions are reflected in quantitative research designs? a. transformative b. constructivist c. postpositivist d. pragmatist
Answer:
postpositivist
Step-by-step explanation:
Of the all four options "post positivist" philosophical assumption are reflected in quantitative research designs
"post positivist" believes that, theory, hypothesis, background knowledge,believes and values of researchers can alter the actual observations. Post positivist consider both quantitative and qualitative methods to be a valid form of approaches unlike "positivist" which emphasize only on quantitative methods.
The philosophical assumption reflected in quantitative research designs is postpositivist. Postpositivism believes in the existence of an objective reality that can be studied through empirical observation and measurement.
Explanation:The philosophical assumption reflected in quantitative research designs is postpositivist. Postpositivism is a philosophical stance that believes in the existence of an objective reality that can be studied through empirical observation and measurement. Quantitative research designs aim to gather numerical data that can be analyzed statistically to uncover patterns and relationships in the data. A postpositivist approach to research values objectivity, generalizability, and the use of rigorous methodologies.
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Find the coordinates of the vertex for the parabola defined by the given quadratic function f(x) = (x + 2)^2 + 2 a) (0,2) b) (2.0) c) (-2.2) d) (-2,-2) e) none
Answer:
(-2,2)
Step-by-step explanation:
Let's find the answer.
Because a tangent line for a parabola function is equal to 0 only at its vertex then:
[tex]f(x)=(x+2)^{2}+2[/tex]
[tex]f'(x)=2*(x+2)[/tex]
[tex]f'(x)=2x+4[/tex] so then:
[tex]f'(x)=0[/tex] when
[tex]0=2x+4[/tex]
[tex]-2=x[/tex]
For x=-2 f(x) is:
[tex]f(x)=(x+2)^{2}+2[/tex]
[tex]f(1)=(-2+2)^{2}+2[/tex]
[tex]f(x)=2[/tex]
In conclusion, the vertex of the given parabola is (-2,2), so the answer is C. Although in your answer is reported as (-2.2) but I think was a typing mistake.
Problem 2 Previous Problem Problem List Next Problem (1 point) Determine ifv is an eigenvector of the matrix A No 1 5 0 0 7 0 -2 0 5 A = ,v= 5 2 0 1 No 2. 0 -4-8 -1 2 8 4 C A = ,v= -4 -4-4 -1 3. Yes -1 2 0 8 0 -3 0 5 A = -6 2 5 1 Note: You can earn partial credit on this problem. Submit Answers Preview My Answers You have attempted this problem 1 time. Your overall recorded score is 33%. You have 1 attempt remaining.
Problem 4 Previous Problem Problem List Next Problem (1 point) The matrix -6 A = -9 -5 k has two distinct real eigenvalues if and only if k
A company provided the following data: Selling price per unit: 60 Variable cost per unit 20 Total fixed costs 400,000 HOw many units must be sole to earn a profit of $40,000?
Answer:
The company needs to sell 9000 units in order to turn a profit of $40,000
Step-by-step explanation:
Hello, great question. These types are questions are the beginning steps for learning more advanced Algebraic Equations.
From the question we can get some important hints before creating our formula. First the Selling Price will be profit so it will be a positive number, but both unit cost and fixed costs are losses so they will be negative values in our formula. Also our formula will depend on the amount sold which we can represent as the variable x. With these hints we can create our formula as the following
[tex](60x-20x)-400,000 = y[/tex]
Where:
x is the amount of units created and soldy is the total profit after selling x-unitsNow that we have our formula the question asks how many units need to be sold in order to earn a profit of $40,000. We can calculate this by replacing the $40,000 with y and solving for x like so,
[tex](60x-20x)-400,000 = 40,000[/tex] .... add 400,000 on both sides
[tex]40x= 360,000[/tex] ... divide both sides by 40
[tex]x= 9000[/tex]
The company needs to sell 9000 units in order to turn a profit of $40,000
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
According to the data reported by the New York State Department of Health regarding West Nile Virus for the years 2000-2004, the least squares line equation for the number of reported dead birds (x) versus the number of human West Nile virus cases (y) is ŷ = −10.2638 + 0.0491x. If the number of dead birds reported in a year is 844, how many human cases of West Nile virus can be expected? (Round your answer to the nearest whole number.)
Final answer:
Using the least squares line equation given, by substituting 844 for the number of reported dead birds, we calculate an expected number of approximately 31 human cases of West Nile virus.
Explanation:
To estimate the number of human cases of West Nile virus based on the number of reported dead birds using the least squares line equation ŷ = −10.2638 + 0.0491x, we need to substitute x with the number of reported dead birds. In this case, x = 844.
The calculation would be:
ŷ = −10.2638 + (0.0491 × 844)
This simplifies to:
ŷ = −10.2638 + 41.4474
Which further simplifies to:
ŷ = 31.1836
After rounding the result to the nearest whole number, we get that approximately 31 human cases of West Nile virus can be expected.
The expected number of human cases of West Nile virus when 844 dead birds are reported is approximately 31, calculated using the given least squares line equation.
To predict the number of human West Nile virus cases when 844 dead birds are reported, we use the least squares line equation:
Y = -10.2638 + 0.0491xHere, x represents the number of dead birds, which is 844.
We substitute x into the equation:Y = -10.2638 + 0.0491 * 844
First, calculate the product:0.0491 * 844 = 41.4404
Next, add the product to the intercept:Y = -10.2638 + 41.4404
Y = 31.1766
Rounding to the nearest whole number, the expected number of human cases of West Nile virus is 31.
Which type of conic section is described by the following equation?
Answer:
C. Hyperbola opening up and down
Step-by-step explanation:
A graph tells the tale.
___
The term with the positive coefficient identifies the axis along which the hyperbola opens. Here, that is the y-axis, so the figure opens up and down.
The minus sign between the squared terms indicates it is a hyperbola, rather than a closed curve (ellipse or circle). The fact that both terms are squared indicates it is not a parabola.
A car's velocity changes at a rate of 36 miles per hour in 0.5 hour.
What is its acceleration, in miles/hour2?
(Note: Do not specify units in your answer. Your answer must be only a number.)
Answer:
72
Step-by-step explanation:
In order to find the acceleration we need first to defined it, so:
acceleration=((final velocity)-(initial velocity))/time interval
[tex]a=(vf-vi)/dt[/tex]
But (vf-vi) actually represents the velocity change, so (vf-vi)/dt represents the velocity change rate. This means that in our case:
[tex]a=(36miles/hour)/(0.5hours)[/tex]
[tex]a=72miles/hour^2[/tex]
In conclusion the acceleration is [tex]a=72miles/hour^2[/tex], without units just 72.
3. [6 Pts] Give an example of two uncountable sets A and B such that AnB is (a) finite, (b) countably infinite, (c) uncountably infinite.
Answer with explanation:
Let two uncountable sets A and B .
(a).Let A= [2,3]=uncountable
B= [3,4)=uncountable
[tex]A\cap B [/tex]={3}= finite
Hence, [tex] A\cap B [/tex] is finite set .
(b).Let A= Set of positive real numbers=Uncountable
B= Set of negative real numbers and positive integers= Uncountable
Now, [tex]A\cap B[/tex]=Set of positive integer numbers =countably infinite set.
Hence, [tex]A\cap B[/tex]is countably infinite .
(c). Let A= Set of real numbers=Uncountable
B= Set of irrational numbers =Uncountable
Then, [tex]A\cap B[/tex]= Set of irrational numbers= Uncountable.
Hence, [tex]A\cap B[/tex] is uncountable when A is set of real numbers and B is set of irrational numbers.
Real numbers A and B can be examples of the uncountable sets. By modifying these, their intersection could be finite, countably infinite, or uncountably infinite based on its definition. These sets and their intersections depict the distinct characteristics of uncountable sets.
Explanation:In Mathematics, an uncountable set is a set that cannot be put into one-to-one correspondence with the set of natural numbers or integers. In other words, it has more elements than the set of natural numbers.
Since the intersection of two uncountable sets could be any size (from empty to uncountably infinite), we can creatively define the sets to meet the requirements. Consider the real numbers A = [0,1] and B = [1,2] as our uncountable sets.
For (a) finite, let's modify B and set B to only include the single element {1}, their intersection, which is finite.
For (b) countably infinite, instead B = {x in Q | 1 ≤ x ≤ 2}, where Q is the set of rational numbers. They intersect at countably infinite set of rational numbers between 1 and 2.
For (c) uncountably infinite. If both A and B are intervals on the real number line that have nonempty intersection, their intersection is uncountably infinite.
Learn more about Uncountable Sets here:
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n a study of speed dating, male subjects were asked to rate the attractiveness of their female dates, and a sample of the results is listed below (1equalsnot attractive; 10equalsextremely attractive). Construct a confidence interval using a 95% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult females? 7, 7, 3, 8, 5, 6, 6, 9, 9, 8, 6, 9 What is the confidence interval for the population mean mu? 5.8less thanmuless than 8.1 (Round to one decimal place as needed.) What does the confidence interval tell about the population of all adult females? Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. A. We are 95% confident that the interval from nothing to nothing actually contains the true mean attractiveness rating of all adult females. (Round to one decimal place as needed.) B. The results tell nothing about the population of all adult females, because participants in speed dating are not a representative sample of the population of all adult females. C. We are confident that 95% of all adult females have attractiveness ratings between nothing and nothing. (Round to one decimal place as needed.)
The confidence interval is [tex]\fbox{(5.8, 8.1)}[/tex] and [tex]\fbox{\text{Option A}}[/tex] is correct.
Further Explanation:
Given:
The least value is [tex]1[/tex] that is the least attractive.
The highest value is [tex]10[/tex] that is the most attractive.
The observations are,
7, 7, 3, 8, 5, 6, 6, 9, 9, 8, 6, 9.
Calculation:
The sum of all observations is [tex]83[/tex].
The population mean is [tex]\mu[/tex].
The standard deviation [tex]s[/tex] is [tex]1.832[/tex].
The sample mean [tex]\bar^{X}[/tex] is [tex]6.92[/tex].
Level of significance [tex]\alpha[/tex] = [tex]5\%[/tex].
Formula for confidence interval = [tex]\left( \bar{X} \pm t_{n-1, \frac{\alpha}{2}\%} \frac{s}{\sqrt{n}} \right)[/tex]
Confidence interval =[tex]\left( 6.92 \pm t_{12-1, \frac{5}{2}\%} \frac{1.832}{\sqrt{12}} \right)[/tex]
The value of [tex]t_{11, \frac{5}{2}\%[/tex]=[tex]2.201[/tex]
Confidence interval = [tex]( 6.92 \pm 2.201}\times \frac{1.832}{\sqrt{12}}) \right)[/tex]
Confidence interval = [tex]( 6.92 - 2.201}\times 0.5288 ,6.92 + 2.201}\times \0.5288) \right)[/tex]
Confidence interval = [tex](6.92-1.1639,6.92+1.1639)[/tex]
Confidence interval = [tex]\fbox{(5.8, 8.1)}[/tex]
The [tex]95\%[/tex] confidence interval gives us an idea that [tex]95\%[/tex] chances of the true mean or population mean lies in the interval.
A. We are [tex]95\%[/tex] confident that the interval from [tex]5.8[/tex] to [tex]8.1[/tex] actually contains the true mean of attractiveness rating of all adult females.
B. The results tell nothing about the population of all adult females, because participants in speed dating are not a representative sample of the population of all adult females.
C. We are confident that [tex]95\%[/tex] of all adult females have attractiveness ratings between [tex]5.8[/tex] and [tex]8.1[/tex].
[tex]\fbox{\text{Option A}}[/tex] is Correct as we are [tex]95\%[/tex] confident that the interval from [tex]5.8[/tex] to [tex]8.1[/tex] actually contains the true mean of attractiveness rating of all adult females.
Option B is not correct as the confidence interval tells us about the population mean.
Option C is not correct as the individual rating can be more than [tex]5.8[/tex] or less than the [tex]8.1[/tex].
Learn More:
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Answer Details:
Grade: College Statistics
Subject: Mathematics
Chapter: Confidence Interval
Keywords:
Probability, Statistics, Speed dating, Females rating, Confidence interval, t-test, Level of significance , Normal distribution, Central Limit Theorem, t-table, Population mean, Sample mean, Standard deviation, Symmetric, Variance.
The confidence interval for the population mean attractiveness rating of all adult females is 5.8 to 8.1, and we are 95% confident that this interval contains the true mean attractiveness rating.
In this study of speed dating, male subjects were asked to rate the attractiveness of their female dates on a scale from 1 (not attractive) to 10 (extremely attractive). A sample of attractiveness ratings was provided: 7, 7, 3, 8, 5, 6, 6, 9, 9, 8, 6, 9. The objective is to construct a confidence interval with a 95% confidence level to estimate the true mean attractiveness rating of all adult females.
The calculated confidence interval is 5.8 to 8.1. This means that we are 95% confident that the interval from 5.8 to 8.1 contains the true mean attractiveness rating of all adult females. The margin of error, represented by the range of the interval, provides a level of precision in our estimation.
The confidence interval suggests that the true mean attractiveness rating for all adult females falls within the specified range. It does not provide an exact value for the mean, but it indicates a plausible interval within which the true mean is likely to be found. Additionally, the confidence interval does not imply a causal relationship, but rather a statistical estimate based on the observed sample.
5. The Fibonacci numbers fn are defined as follows: fi -1, f2-1, and f- fn-1+ f-2 for n 2 3, that is, from the third number on each number is the sum of the previous two numbers. The first ten Fibonacci numbers are: Find f11, f12, f13, and fia.
Answer with explanation:
The Fibonacci series is as follows:and it's first ten entries are
0,1,1,2,3,5,8,13,21,34,.....
You can see that after first two terms, each term that is from third term,sum of previous two consecutive terms.
1→1
2→0
3→1=1+0
4→2=1+1
5→3=2+1
6→5=3+2
7→8=5+3
8→13=5+8
9→21=13+8
10→34=21+13
[tex]\rightarrow f_{11}=f_{10}+f_{9}\\\\=34+21\\\\f_{11}=55\\\\\rightarrow f_{12}=f_{11}+f_{10}\\\\=55+34\\\\f_{12}=89\\\\\rightarrow f_{13}=f_{12}+f_{11}\\\\=89+55\\\\f_{13}=144\\\\\rightarrow f_{ia}=f_{i(a-1)}+f_{i(a-2)}[/tex]