Answer:
z = 1.83<1.96
null hypothesis is accepted
The sample is came from a population mean
Step-by-step explanation:
Step :-1
The sample of 40 measured voltage amounts from a unit have a mean of 123.59 volts and a standard deviation of 0.31 volts
given sample size n =40
mean of the sample ×⁻ = 123.59 volts
standard deviation of sample σ = 0.31 volts
Step2:-
Null hypothesis :-
the sample is from a population with a mean equal to 120 volts.
H₀ : μ =120
Alternative hypothesis:-
H₁ : μ ≠120
level of significance:- α =0.05
Step 3:-
The test statistic
[tex]z = \frac{x_{-}-mean }{\frac{S.D}{\sqrt{n} } }[/tex]
substitute values and simplification
[tex]z = \frac{123.59-120}{\frac{0.31}{\sqrt{40} } }[/tex]
on simplification we get the calculated value
z = 1.83
The tabulated value z =1.96 at 0.05 % level of significance
Conclusion:-
Calculated Z < The tabulated value z =1.96 at 0.05 % level of significance
so the null hypothesis is accepted
The sample is came from a population mean
Answer: REJECT the null hypothesis; there IS sufficient evidence to warrant a rejection of the claim that the mean voltage is 120 volts.
t-calculated = 73.242
t-critical = 2.023
What are the quotient and remainder of (3x^4+ 2x^2 - 6x + 1) = (x + 1)
Answer: Im 75% sure the answer is A. Its either A or B.
Step-by-step explanation:
A polynomial of degree at least 3 where all the zeros are positive whole numbers
We can build a polynomial given it's degree and zeros. Below I am going to show how we do that, and then I will solve the question, finding that one example of a desired polynomial is:
[tex]f(x) = x^3 - 15x^2 + 54x - 40[/tex]
Zeros of a function:
Given a polynomial f(x), this polynomial has roots [tex]x_{1}, x_{2}, x_{n}[/tex] such that it can be written as: [tex]a(x - x_{1})*(x - x_{2})*...*(x-x_n)[/tex], in which a is the leading coefficient.
In this question:
Polynomial of degree 3, so 3 roots.
All positive, I will choose:
[tex]x_1 = 1, x_2 = 4, x_3 = 10[/tex]
I will choose the leading coefficient as a = 1.
Thus
[tex]f(x) = a(x - x_1)(x - x_2)(x - x_3)[/tex]
[tex]f(x) = (x-1)(x-4)(x-10)[/tex]
[tex]f(x) = (x^2-5x+4)(x-10)[/tex]
[tex]f(x) = x^3 - 15x^2 + 54x - 40[/tex]
The image shown in the end of this question shows that this polynomial has three positive roots, also all whole numbers.
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Add a cell phone assembly plant, 80% of the cell phone keypad pass inspection. A random sample of 181 keypads is analyzed. Find the probability that less than 76 in the sample keypads pass inspection.
Answer:
0% probability that less than 76 in the sample keypads pass inspection.
Step-by-step explanation:
I am going to use the normal approximation to the binomial to solve this question.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
Can be approximated to a normal distribution, using the expected value and the standard deviation.
The expected value of the binomial distribution is:
[tex]E(X) = np[/tex]
The standard deviation of the binomial distribution is:
[tex]\sqrt{V(X)} = \sqrt{np(1-p)}[/tex]
Normal probability distribution
Problems of normally distributed samples can be solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
When we are approximating a binomial distribution to a normal one, we have that [tex]\mu = E(X)[/tex], [tex]\sigma = \sqrt{V(X)}[/tex].
In this problem, we have that:
[tex]n = 181, p = 0.8[/tex]
So
[tex]\mu = E(X) = np = 181*0.8 = 144.8[/tex]
[tex]\sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{181*0.8*0.2} = 5.38[/tex]
Find the probability that less than 76 in the sample keypads pass inspection.
Using continuity correction, this is [tex]P(X < 76 - 0.5) = P(X < 75.5)[/tex], which is the pvalue of Z when X = 75.5.
So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{75.5 - 144.8}{5.38}[/tex]
[tex]Z = -12.88[/tex]
[tex]Z = -12.88[/tex] has a pvalue of 0
0% probability that less than 76 in the sample keypads pass inspection.
The ordered pairs in the table below represent a linear function.
What is the slope of the function?
One-fourth
One-half
2
4
Answer:
2Step-by-step explanation:
The ordered pairs are
x | y 2 | 3 5 | 9The slope is:
m = (y2 - y1)/(x2 - x1) m = (9 - 3)/(5 - 2)= 6/3 = 2Answer is 2
Answer:
4
Step-by-step explanation:
The graph is:
x y
1/4 2
1/2 4
Slope formula is (y2-y1/x2-x1)
4-2/0.5-0.25
2/0.25
4
Best of Luck!
i’ll mark brainlist the first personify gets it
I am going to assume 10.42 is 10 minutes 42 secons.
10 min * 60 seconds / per minute, = 600 seconds
600 + 42 = 642 seconds starting
-
8 min * 60 seconds / per minute, = 480 seconds objective
To solve for how long this will take set up an equation,
642 - 1.6t = 480
162 = 1.6t
t = 101.25 days
Since time has a decial, it needs to be rounded up in order for her to be fully below 8 minutes.
Therefore the answer is 102 days.
Cards from an ordinary deck of 52 playing cards are turned face up one at a time. If the first card is an ace, or the second a deuce, or the third a three, or, . . . , or the thirteenth a king, or the fourteenth an ace, and so on, we say that a match occurs. Note that we do not require that (13n + 1)th card be any particular ace for a match to occur but only that it be an ace. Compute the expected number of matches that occur.
Answer:
The expected number of matches that occur is 4.
Refer below for the explanation.
Step-by-step explanation:
Refer to the picture for complete steps.
Which best explains why the expression plus or minus StartRoot b squared minus 4 a c EndRoot cannot be rewritten as b plus or minus StartRoot negative 4 a c EndRoot during the next step?
Answer:
Step-by-step explanation:
let the quadratic eq. be ax²+bx+c=0
or x²+b/a x+c/a=0
or x²+b/ax=-c/a
to complete the square add both sides (b/2a)²or b²/4a²
x²+b/a x+(b/2a)²=b²/4a² -c/a
(x+b/2a)²=(b²-4ac)/(4a²)
taking square root
[tex]x+\frac{b}{2a} =\pm \frac{\sqrt{b^2-4ac} }{2a} \\or\\x=-\frac{b}{2a} \pm\frac{\sqrt{b^2-4ac} }{2a} \\or\\x=\frac{-b \pm\sqrt{b^2-4ac} }{2a}[/tex]
now you must know why -b and not +b
Final answer:
The expression ± √(b² - 4ac) in the quadratic formula refers to the discriminant and cannot be rewritten as b ± √(-4ac) because it would incorrectly separate b from the discriminant and alter the expression's meaning, leading to incorrect solutions.
Explanation:
The student is asking about the quadratic formula, which is used to find the solutions to a quadratic equation of the form at² + bt + c = 0. The formula for the solutions is given by:
-b ± √(b² - 4ac) / 2a
The term ± √(b² - 4ac) cannot be rewritten as b ± √(-4ac) because it alters the original expression's meaning. The square root is taken of the entire expression b² - 4ac, which represents the discriminant of the quadratic equation. It provides information on the nature and number of roots of the equation. Separating b from the discriminant before taking the square root would calculate a different value and therefore lead to incorrect solutions.
Example:
When you substitute the given values, say a = 1, b = 0.0211, and c = -0.0211, into the quadratic formula, you will get:
-0.0211 ± √((0.0211)² - 4(1)(-0.0211)) / (2(1))
Changing the formula to b ± √(-4ac) incorrectly suggests that you can separate b from the discriminant and take the square root of -4ac alone, which would not yield a correct solution.
Two components in a rocket operate independently, and the probability that for every component to fail on a launch is p. Let X denote the number of launches required to have a failure of the first component, and let Y denote the number of launches required to have a failure of the second component, X, Y
Answer: p = X/(1-X)X + Y/(1-Y)Y
Step-by-step explanation:
At a large university a simple random sample of five female professors is selected and a simple random sample of 10 male professors is selected. The two samples are combined to give an overall sample of 15 professors. The overall sample is a A. simple random sample. B. biased due to imbalance. C. a stratified sample. D. All of the above
Answer:
D. All of the above
Step-by-step explanation:
Samples may be classified as:
Random: Basically, put all the options into a hat and drawn some of them.
Systematic: Every kth element is taken. For example, you want to survey something on the street, you interview every 5th person, for example.
Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.
Stratified: Also divides the population into groups. However, then only some elements of the group are surveyed.
In this problem:
Two random samples are selected and combined. The combination is a random sample. So A. is correct.
They are not balanced. More male professors than female are chosen. So B. is correct.
The teachers are divided into groups(male and female). And some members of each group are selected. So C. is correct.
So the correct answer is:
D. All of the above
What is the area of the following shape?
Answer:
104 m^2
Step-by-step explanation:
We first find the area of the rectangle
A = l*w
A = 10*8
A = 80
Then we find the area of the triangle
A = 1/2 bh
A = 1/2 (8)(6)
= 24
Then we add the areas together to find the total area
80+24 = 104
A group of statistics students conducted a survey about smoking habits on campus to determine the proportion of students who believe that smoking hookah (a water pipe) is less harmful than smoking cigarettes. Of the 50 students surveyed, 45 think that smoking hookah is less harmful than smoking cigarettes.
Which of the following is a reason that this group of students should not calculate a confidence interval for the proportion of all students who believe that smoking hookah is less harmful than smoking cigarettes? Check all that apply.
a) The sample needs to be random but we don’t know if it is.
b) The actual count of students who believe that smoking hookah is less harmful than smoking cigarettes is too small.
c) The actual count of students who do not believe that smoking hookah is less harmful than smoking cigarettes is too small.
d) n(p^) is not greater than 10.
e) n(1 - p^) is not greater than 10.
Answer:
The answer is A, C and D
Step-by-step explanation:
a
c
d
The correct answer is a) The sample needs to be random but we don’t know if it is.
Calculate success by multiplying the sample % by the sample size to make sure the sample size is adequate.
Why is it necessary to satisfy the random condition?The situation at random we receive impartial population data from random sampling. It might be dangerous to draw conclusions about a community from data that was not randomly chosen samples since such data typically contains some type of bias.
Calculate success by multiplying the sample % by the sample size to make sure the sample size is adequate, and calculate failure by multiplying one less than the sample percentage by the sample size. The condition is satisfied if both of these items are larger than ten.
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What are the functions of money?
Answer:
The functions of money are:
Function # 1. A Medium of Exchange: ...
Function # 2. A Measure of Value: ...
Function # 3. A Store of Value (Purchasing Power): ...
Function # 4. The Basis of Credit: ...
Function # 5. A Unit of Account: ...
Function # 6. A Standard of Postponed Payment:
Explanation:
My parents are bankers.
Solve for 3x minus one equals 27
Answer:
the answer is 9.3
Step-by-step explanation:
Answer:
9.
Step-by-step explanation:
You would subtract the one to isolate the variable so 3x = 27 then divide by 3 so the answer is 9.
What’s the value of Y?
Answer:
44
Step-by-step explanation:
if 88 is the right angle degree, that means the acute angle would be half of 88.
88÷2=44
Lena is a college basketball player who has made 75%, percent of the free-throws she has attempted in her career. she decided to practice a new technique for shooting her free-throws. lena was curious if this new technique produced significantly better or worse results. she tried the new technique and made 70%, percent of 50 attempts. here's lena's alternative hypothesis: ha : the proportion of attempts made using this new technique is. what is an appropriate way for lena to finish her alternative hypothesis a.equal to 75% b.not equal to 75% c.not equal to 70% d.equal to 70%
Answer:
b
Step-by-step explanation:
On a very hot summer day, 5 percent of the production employees at Highlander Steel are dehydrated. The production employees are randomly selected for a special in-depth study on dehydration. What is the probability of randomly selecting 8 production employees on a hot summer day and finding that none of them are dehydrated
Answer:
P(X=0) = 0.0332
Step-by-step explanation:
5% of the employees are dehydrated. I.e. p = 5/100
p = 0.05
The percentage of employees that are not dehydrated = 100-5 = 95%
q = 1 - p = 1 - 0.05
q = 0.95
A total of 8 employees were randomly selected. n = 8
This is a binomial distribution question
P(X =r) = nCr (p^r)q^(n-r)
n = 8, r = 0
n -r = 8-0 = 8
P(X = 0) = 8C0 (0.05^0)(0.95^8)
8C0 = 1
P(X=0) = 1 * 1* 0.6634
P(X=0) = 0.6634
Answer:
The probability of picking 8 employee and none of them is dehydrated is 0.66
Step-by-step explanation:
P(employee is dehydrated) = 5%=5/100=1/20= 0.05
P(employee not dehydrated) = 1 - 0.05= 0.95
The probability of picking 8 employee and they are not dehydrated is:
= (0.95)^8
= 0.6634204312890625
= 0.66
Two functions are shown in the table below.
~
Complete the table on your own paper, then select the value that is a solution to f(x) = g(x). (2 points)
Group of answer choices
A. x = 2
B. x = 3
C. x = 5
D. x = 6
Answer:
D
Step-by-step explanation:
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Expression is equivalent 1/3+(3/4+2/3)?
The expression 1/3 + (3/4 + 2/3) is equivalent to 7/4.
Explanation:The expression is equivalent to 1/3 + (3/4 + 2/3). To solve this expression, we need to simplify the inner parentheses first. Adding 3/4 and 2/3, we get a common denominator of 12:
3/4 + 2/3 = 9/12 + 8/12 = 17/12Now, we can substitute the simplified fraction back into the original expression:
1/3 + (3/4 + 2/3) = 1/3 + 17/12To add the fractions with different denominators, we need to find a common denominator. In this case, the common denominator is 12:1/3 + 17/12 = 4/12 + 17/12 = 21/12Finally, we can simplify the fraction by dividing the numerator and denominator by their greatest common divisor, which is 3:21/12 = (3 * 7) / (3 * 4) = 7/4Therefore, the expression 1/3 + (3/4 + 2/3) is equivalent to 7/4.
The probability that Linda receives spam e-mail is 4 percent. If she receives 520 e-mails in a week, about how many of them can she expect to be spam?
Answer:21 (2 sf)
Step-by-step explanation:
10%0f 520=52
1%0f 520=52 divide by 10 =5.2
5.2x4=20.8
=21 to 2sf
Given that’s the measure of the angle is 109, what is the measure of angle k?
Answer:
k is also 109 degrees bcoz they are corresponding angles
If you double a number and then add 32, you get two ninths
of the original number. What is the original number?
Answer:
The number is -18
Step-by-step explanation:
Let x be the original number
2x +32 = 2/9x
Multiply each side by 9 to get rid of the fractions
9(2x +32) =9* 2/9x
18x +288 = 2x
Subtract 18x from each side
18x-18x+288 = 2x-18x
288 = -16x
Divide each side by -16
288/-16 = -16x/-16
-18 =x
Answer:
–18
Step-by-step explanation:
let the number is [tex]x[/tex], from the problem we know that
[tex]2x+32=\frac{2}{9}x
\\9x+144=x
\\x=-\frac{144}{8}=-18[/tex]
What type of triangle, if any can be formed with angle measures of 32 degrees, 126 degrees, and 32 degrees?
Answer 1 only an obtuse triangle
Answer 2 either an acute isosceles triangle or an obtuse isosceles triangle
Answer 3 only an acute isosceles triangle
Answer 4 no triangle
No triangle can be formed.(answer 4)
What is triangle?In Geometry, a triangle is a three-sided polygon that consists of three edges and three vertices. The most important property of a triangle is that the sum of the internal angles of a triangle is equal to 180 degrees
We have,
Angles of triangle= 32 degrees, 126 degrees , 32 degrees
We know,
All triangles must have angles that measure up to 180 degrees.
[tex]32^{o} +126^{o} + 32^{o}[/tex]
=[tex]190^{o}[/tex] > [tex]180^{0}[/tex]
Hence ,That means that is no triangle can be formed.
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The sum of the given angles exceeds 180 degrees, which violates the basic rule of triangles, so no triangle can be formed with these measures.
Explanation:To determine what type of triangle can be formed with angle measures of 32 degrees, 126 degrees, and 32 degrees, we need to consider two rules: First, the sum of the angles in any triangle must be 180 degrees. Second, the classification of whether a triangle is acute, obtuse, or right is based on the measures of its angels.
Adding the given angles together (32 degrees + 126 degrees + 32 degrees), we get 190 degrees. Since this sum is greater than 180 degrees, it violates the first rule of triangles. Therefore, no triangle can be formed with these given angle measures.
What is the surface area of this square pyramid
Answer 144 ft2
Step-by-step explanation:
Answer:
The surface area is 81 feet squared
Step-by-step explanation:
IM SO SORRY! the answer is 33 feet squared
please help asap thanks in advance.
Answer:
hope this helps
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Find the arc length of the shaded region. Multiply through by #(3.14) Round solution to
tenth place. Ex. 1.2
90°
Given:
The radius of the circle is 12 units.
The central angle of the shaded region is 90°
We need to determine the arc length of the shaded region.
Arc length:
The arc length of the shaded region can be determined using the formula,
[tex]Arc \ length=(\frac{\theta}{360} ) 2 \pi r[/tex]
substituting [tex]\theta=90[/tex] and r = 12, we get;
[tex]Arc \ length=(\frac{90}{360} ) 2 (3.14)(12)[/tex]
Multiplying the terms, we have;
[tex]Arc \ length=\frac{6782.4}{360}[/tex]
Dividing, we get;
[tex]Arc \ length=18.84[/tex]
Rounding off to the nearest tenth, we get;
[tex]Arc \ length =18.8[/tex]
Thus, the arc length of the shaded region is 18.8 units.
A relation is a special type of function.
A. True
B. False
(30) points
What is the volume of the square pyramid with base edges 32 mm and slant height 34 mm?
9,920 mm3
10,010 mm3
7,680 mm3
10,240 mm3
Answer:
V = 10,240mm^3
Step-by-step explanation:
The volume of pyramid is given by the following formula:
[tex]V=\frac{1}{3}bh[/tex] (1)
b: base of the pyramid = (32mm)^2
h: height
Thus, it is necessary to find the value of h, by using the Pitagoras's theorem, one half of the base and the slant height (which forms a rectangle triangle with h):
[tex]h=\sqrt{(34)^2-(16)^2}=30mm[/tex]
by replacing in (1) you obtain:
[tex]V=\frac{1}{3}(32mm)^2(30mm)=10,240\ mm^3[/tex]
hence, the volume is 10240mm^3
2.
1. A small town's population is growing at
an exponential rate. In 2010, there were
700 residents in the town. In 2011 there
were 770 residents and in 2012, there
were 847 residents. What equation can
be used to determine p, the number of
residents in 2018?
Answer:
[tex]P(8)=700\cdot(1.1)^8\approx 1500[/tex], where t is the number of years since 2010.
Step-by-step explanation:
See my attached image for an explanation!
What is the surface area of this cylinder? Use 3.14 and round your answer to the nearest hundredth.
Of the 100 students enrolled at the dance studio, 50 take ballet and 24 take tap dancing. Eight of the students who take ballet also take tap dancing. If a student at the studio is chosen at random, find the probability that they take ballet, if it is known that they do not take tap dancing
Answer:
42 over 100
Step-by-step explanation:
Answer:21/38
Step-by-step explanation: