Each voter in a county is given a number that uniquely identifies them. A computer is used to select 500 of these numbers at random. The 500 voters identified by the computer are interviewed for a study. Which type of sampling was used? convenience cluster systematic random

Answers

Answer 1

Random selection was used

Answer 2

Answer:

Random sampling

Step-by-step explanation:

Given : . A computer is used to select 500 of these numbers at random. The 500 voters identified by the computer are interviewed for a study.

To Find : Which type of sampling was used?

1. convenience

2. cluster

3. systematic

4. random

Solution :

Definition of convenience sampling: A type of non-probability sampling method where the sample is taken from a group of people easy to contact

Definition of cluster sampling :In this sampling one divides the population into separate groups Then, a simple random group is selected from the population.

Definition of systematic sampling : A type of sampling method in which sample members from a larger population are selected according to a random starting point and a fixed, periodic interval. The interval is called sampling interval, is calculated by dividing the population size by the desired sample size.

Definition of random sampling :It is a type of sampling technique in which each sample has an equal probability of being chosen.

After considering all the definitions we can see that in the given case random sampling was used .

Hence random sampling was used .

Related Questions

Determine whether the variable is qualitative or quantitative. number of flights

Answers

quantitative

Because you can count the number of flights, it is quantitative.

Find two numbers, if their sum is (−1/3) and their difference is 18

Answers

x + y = - 0.3333333 That's the decimal equivalent of - 1/3
x - y = 18 Add these two together.
2x = 17.66666 Divide by 2
x = 8.833333

8.83333 + y = - 0.333333
y = - 0.333333 - 8.83333
y = - 9.16666

You should check this using the difference.
It will not come out exactly, but you do get a bunch of nines.

|x+18|=1

PLEASE HELP EVERYONE, ONLY ONE ATTEMPT TO GO!!!!!!!
40POINTS******************
tHE LINES ARE ABSOLUTE VALUE

Answers

Solve for x over the real numbers:
abs(x + 18) = 1

Split the equation into two possible cases:
x + 18 = 1 or x + 18 = -1

Subtract 18 from both sides:
x = -17 or x + 18 = -1

Subtract 18 from both sides:
Answer: x = -17 or x = -19

_________________________________

Solve for x over the integers:
abs(x + 18) = 1

Split the equation into two possible cases:
x + 18 = 1 or x + 18 = -1

Subtract 18 from both sides:
x = -17 or x + 18 = -1

Subtract 18 from both sides:

Answer: x = -17 or x = -19

The absolute value, or modulus, of a number is its distance from zero, or essentially its magnitude.

The absolute value produces a positive answer.

We have this definition for the absolute value, taking into account its different values for different signs:

[tex]|x|= \left \{ {{x, \ \ \ x \ \geq \ 0} \atop {-x, \ \ \ x \ \ \textless \ \ 0}} \right.[/tex]

Thus, for [tex]|x+18|=1[/tex], we split the absolute value as such:

[tex]x+18=1[/tex] and [tex]x+18=-1[/tex]

We solve each case.

[tex]x=-17[/tex] and [tex]x=-19[/tex]

We check these solutions.

[tex]|-17+18|=1\\|1|=1\\1=1[/tex]
and
[tex]|-19+18|=1\\|-1|=1\\1=1[/tex]

A survey found that 25% of pet owners had their pets bathed proffesionally rather than doing it themselves. If 18 pet owners are randomly selected, the probability that exactly 5 people have their pets bathed proffesionally is

A. 19.99%
B. 19.88%
C. 18.99%
D. 18.88%

Answers

The probability is 19.88%.

This is a binomial distribution, because there are two outcomes, the events are independent of each other, and there is a fixed number of trials. The binomial distribution is given by:

[tex](_k^n)p^k(1-p)^{n-k}[/tex]

For this, n is 18; k is 5; p is 0.25:
[tex](_5^{18})(0.25)^5(1-0.25)^{18-5} \\ \\=\frac{18!}{5!13!}(0.25)^5(0.75)^{13} \\ \\=8568(0.25)^5(0.75)^{13} \\=0.1988=19.88%[/tex]

The sum of a number (n) and 20 is 55. Which equation shows this relationship?

Answers

sum is an addition
n + 20 = 55

A pitcher of fruit punch holes 2 gallons of nine people share the entire pitcher equally how much punch does each person get?

Answers

Well, first you must divide the amount of gallons by the amount of people.
2/9 = 2/9 gallons which would be about 3.5 cups.

(Personally I would do 2/9 cups)

bank discount look at the file please to answer questions

Answers

Given:
Bank discount formula:
Interest/Discount = Face Value/Principal * Rate * term

Maturity Value = Face Value/Principal

Proceeds = Maturity Value - Bank Discount

2) Face Value = 9,700 ; Discount Rate = 9.5% ; Term = 135 days
Discount = 9,700 * 0.095 * 135/360
Discount = 345.56
Proceeds = 9,700 - 345.56 = 9,354.44

3) Face Value = 15,600 ; Discount rate = 7.25% ; Term = 270 days
Discount = 15,600 * 0.0725 * 270/360
Discount = 848.25

4) Proceeds = 15,600 - 848.25 = 14,751.75

Define the formula for a parabola (a quadratic function) that has horizontal intercepts (roots) at x = − 8 x=-8 and x = − 4 x=-4 and passes through the point ( 0 , − 7 ) (0,-7) .

Answers

The form of it will be
.. y = a(x +8)(x +4)
At x=0, this is
.. -7 = 32a
.. a = -7/32

The formula is
.. f(x) = (-7/32)(x +8)(x +4)

Final answer:

The formula for a parabola with roots at x=-8 and x=-4, and which passes through the point (0,-7), is y = -7/32(x + 4)(x + 8).

Explanation:

The formula we're looking for is in the form of a quadratic function, generally expressed as

y = ax² + bx + c. Our roots are -8 and -4, which we represent in the factors of the equation as (x + 4) and (x + 8). As coefficients multiply to a, we seek a that makes our function pass through the specific point (0, -7). Thus, we substitute the point into the function giving -7 = a(0+4)(0+8) leading us to a = -7/32. So, the equation of the parabola asked is

y = -7/32(x + 4)(x + 8).

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What is the value of a, if a2 – 64 = 0 and a > 0?

Answers

a^2 -64 = 0

isolate the a

a² - 64 (+64) = 0 (+64)

a² = 64

√a² = √64

a = √64

a = 8

hope this helps

Whats the sum 3/x + 4/x^2

Answers

the sum is 3x+4/x^2

But that is if the x in the second part is supposed to be squared

Answer:

[tex]\frac{3x+4}{x^2} [/tex]

Step-by-step explanation:

sum of [tex]\frac{3}{x} + \frac{4}{x^2}[/tex]

To find the sum of two fractions we need to make the denominator same

LCD is x^2. we need to get x^2 in the denominator of both fractions

Multiply the first fraction with x

[tex]\frac{3 \cdot x}{ \cdot x} + \frac{4}{x^2}[/tex]

[tex]\frac{3x}{x^2} + \frac{4}{x^2}[/tex]

Denominators are same , now we add the numerators

[tex]\frac{3x+4}{x^2} [/tex]

Please help me with this question:

Riley made a scale drawing of a triangular clock face. Riley used a scale factor of 3 when making her drawing. If the base and the height of Riley's drawing are 10 centimeters and 15 centimeters respectively, what is the area of the triangular clock face?
A. 75 square centimeters
B. 225 square centimeters
C. 675 square centimeters
D. 2,700 square centimeters

Answers

we know that
[scale factor ]=[real]/[drawing]
[real]=[drawing]*[scale factor ]

step 1
find the real values

if the base of Riley's drawing is 10 centimeters
[real]=[drawing]*[scale factor ]--------> 10*3-------> 30 cm
the base of the triangular clock face is 30 cm

the height of Riley's drawing is 15 centimeters
[real]=[drawing]*[scale factor ]--------> 15*3-------> 45 cm
the height of the triangular clock face is 30 cm

the area of the triangular clock face is-----> 45*30/2-------> 675 cm²

the answer is the option C. 675 square centimeters

Thirty runners compete in a cross country race. your school has five runners in the race. what is the probability that three runners from your school place first, second, and third.

Answers

Final answer:

The probability that three runners from the same school finishing first, second, and third can be calculated as the product (5/30) * (4/29) * (3/28). This uses the principles of probability in mathematics.

Explanation:

The problem involves the concept of probability in Mathematics. Let's break this question down using the principles of probability.

For the first runner to be from your school, the probability would be 5/30 as there are 5 runners from your school out of 30 total runners. After one runner from your school has won, there are now 4 runners left from your school and 29 total runners left. So, the probability of the second runner being from your school is 4/29. Similarly, the probability that the third runner is also from your school is 3/28 since there are now three left from your school and 28 in total.

The final probability is the product of all three of these probabilities, so:

P(all three top spots are from your school) = (5/30) * (4/29) * (3/28), which needs to be calculated to get the final result.

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The result is 0.00246, or about 0.25% chance.

To find the probability that three runners from your school place first, second, and third in a race with 30 runners, we need to consider the number of ways to select these three positions from your school's five runners and divide it by the total number of ways to select any three runners from all 30 participants.

Calculate the number of ways to choose 3 runners out of the 5 from your school:

[tex]C(5, 3) = $ \frac{5!}{3!(5-3)!} $ = 10[/tex]

Calculate the number of ways to arrange these 3 runners in the first, second, and third positions. This is equal to the number of permutations of 3 elements:

P(3) = 3! = 6

Calculate the total number of ways to choose 3 runners out of the 30 participants:

[tex]C(30, 3) = $ \frac{30!}{3!(30-3)!} $ = 4060[/tex]

Calculate the number of ways to arrange these 3 runners in the first, second, and third positions:

P(3) = 3! = 6

Finally, calculate the probability that 3 runners from your school place first, second, and third:

[tex]Probability = $ \frac{C(5, 3) \times P(3)}{C(30, 3) \times P(3)} $ = $ \frac{10 \times 6}{4060 \times 6} $ = $ \frac{10}{4060} $ = $ \frac{1}{406} $[/tex]

Thus, the probability is approximately 0.00246 (or 1/406).

andy earned $38 on monday and $34 on tuesday.how many lucky bamboo plants can he buy with the total money he earned?

Answers

How much does each bamboo plant cost. This is impossible to solve without knowing the cost. I you have the cost i would be happy to help.

Find the probability of the independent event. 7) if p (e) = 0.9, p (f ∣
e.= 0.36, and e and f are independent, find p (f).

Answers

If [tex]E[/tex] and [tex]F[/tex] are independent, then [tex]\mathbb P(F\mid E)=\mathbb P(F)[/tex], so that [tex]\mathbb P(F)=0.36[/tex].

A shipment of 20tvs contains 5 that are defective. if 10 of them are randomly chosen for inspection, what is the probability that 2 out of 10 will be defective?

Answers

1/4 of the shipment is defective so if half is randomly chosen to test the answer would be 5/20 or 2/10 so 1/4 or 1/5

Final answer:

Using the hypergeometric distribution, the probability that exactly 2 out of 10 TVs randomly chosen from a shipment of 20 are defective is approximately 34.81%.

Explanation:

To find the probability that exactly 2 out of 10 randomly chosen TVs are defective, we can use the hypergeometric distribution. This distribution applies because we are dealing with a scenario where we have a finite population (20 TVs) and a non-replacement condition (once a TV is chosen for inspection, it is not put back).

The probability formula for the hypergeometric distribution is:

P(X = k) = [(C(g, k) * C(N-g, n-k)) / C(N, n)]

Where:

C(a, b) is the combination of a items taken b at a time.N is the total number of items in the population (20 TVs).g is the number of defective items in the population (5 defective TVs).n is the number of items chosen (10 TVs inspected).k is the number of defective items we're interested in finding within the chosen items (2 defective TVs).

Plugging the numbers into the formula, we have:

P(X = 2) = [(C(5, 2) * C(15, 8)) / C(20, 10)]

P(X = 2) = [(10 * 6435) / 184756]

P(X = 2) = [64350 / 184756] ≈ 0.3481

So, the probability that exactly 2 out of 10 TVs inspected will be defective is approximately 0.3481 or 34.81%.

Find the trace on the xy-plane of the sphere having center at (−1, 3, −1) and radius 2.

Answers

Hi,

The sphere has for equation :(x+1)²+(y-3)²+(z+1)²=4
The xy plane has for equation z=0
The trace off the sphere in the xyplane is
(x+1)²+(y-3)²=4 (the circle of center (-1,3,0) &nd 2 as radius)

Final answer:

The trace on the xy-plane of a sphere with center (-1, 3, -1) and radius 2 is a circle with center (-1, 3) and radius 2, represented by the equation (x + 1)² + (y - 3)² = 4.

Explanation:

The question asks to find the trace on the xy-plane of the sphere having a center at (-1, 3, -1) and a radius 2.

The trace on the xy-plane of a sphere is essentially the circle that is formed when the sphere intersects the xy-plane.

Since the center of the sphere is (-1, 3, -1), and the sphere intersects the xy-plane (z=0), we keep the x and y coordinates of the center the same for the circle, meaning the center of the circle will be (-1, 3). The radius of the circle remains the same as the sphere, which is 2.

The equation for a circle in the xy-plane with center (h, k) and radius r is given by (x - h)² + (y - k)² = r².

Therefore, plugging in the values for this specific circle gives us the equation (x + 1)² + (y - 3)² = 4.

This equation represents the trace of the sphere on the xy-plane.

Find two different sets of parametric equations for the given rectangular equation (there are many correct solutions)

x^2+4y^2 - 16=0

Answers

Wait, i need to know what ^ is

a motorboat travels 432 kilometers on 6 hours going upstream and 384 km in 4 hours going downstream. What is the rate of the boat in still water and what is the rate of the current.
please help slove and steps

Answers

Going upstream: 432 km / 6 hours = 72 km/h
Going downstream: 384 km / 4 hours = 96 km/h
Going upstream against the current means that the effective speed is:
r_boat - r_current = 72
Meanwhile, going downstream with the current means;
r_boat + r_current = 96
Adding both equations (to cancel out r_current) gives:
2r_boat = 72 + 96
r_boat = 84 km/h
Substituting back into one of the original equations: r_current = 12 km/h.

Answer:

the answer is 12

hope i helped

Step-by-step explanation:

Wastewater is filling barrels at the rate of 11 quarts per hour. The recycling facility picks up 120 full barrels on each trip, and each barrel holds 12 quarts of wastewater. How many days are between each pickup? Show your work to receive full credit. (10 points)

Answers

(1 h)/(11 qt) * (12 qt)/(1 barrel) * (120 barrels/pickup) * (1 day)/(24 h)
.. = 12*120/(11*24) day/pickup
.. = 5 5/11 days/pickup

120 barrels will be filled every 5 5/11 days. Some trips will be 5 days apart, some trips will be 6 days apart.

I’m going to cook a turkey for 14 people and I want to allow 3/4ib of turkey for each person 1ib=450g what size will I need

Answers

In pounds, 14*(3/4) lb = 10.5 lb

In kg, (10.5 lb)*(0.450 kg/lb) ≈ 4.73 kg

_____
In grams, with your conversion factor, it is 4725 grams. Using the proper conversion factor, it is about 4762.7 grams, almost 4.8 kg.

Final answer:

To find the size of turkey needed for 14 people, multiply their serving size by the number of people and convert it from pounds to grams

Explanation:

To calculate the size of turkey you will need, you first need to find the total weight of the turkey required for 14 people. Since you want to allow 3/4 lb of turkey for each person, the total weight of turkey required will be 14 * 3/4 lb.

Now, 1 lb is equal to 450g. So, to convert the weight from pounds to grams, you can multiply the weight in pounds by 450.

Therefore, to find the size of turkey you will need, multiply the total weight of turkey required in pounds (14 * 3/4) by 450. This will give you the answer in grams.

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What is the area of the figure below? Please explain!

Answers

6 +2.5 = 8.5

the horizontal line is 2.5 +2.5 = 5m
(use Pythagorean theorem)

area = 8.5 * 5 = 42.5 / 2 = 21.25 m^2

answer is the 3rd choice

area = 8.5 * 5 = 42.5 / 2 = 21.25 m^2

therefore the correct answer is C

hope this helps :)

At the Golden Gopher Mall , 1,300 People Took the Coke/Pepsi Challenge, 55% Of those challenged preferred Coke. how many people selected coke?

Answers

whatever% of anything is just (whatever/100) * anything.

therefore, 55% of 1300 is just, (55/100) * 1300, that many.

What is the center of the circle represented by this equation? x^2 + (y + 9)^2 = 25 A) (3, 5) B) (0, 25) C) (9, 25) D) (0, -9)

Answers

the equation of the circle is in form:

(x-h)² + (y-k)² = r²

(h,k) are the center and r is the radius.

So from the given equation we can see that the center is at (0,-9).

Hope this helps :)

An airline sells all tickets for a certain route at the same price. if it charges 250 dollars per ticket it sells 5000 tickets. for every 5 dollars the ticket price is reduced, an extra 500 tickets are sold. it costs the airline a hundred dollars to fly a person. what price will generate the greatest profit for the airline?

Answers

let's look at the demand quantity as a function of price. Th problem tells us that q(250)= 500
the rate of change of q is a constant, thus, q is a line whose slope is -500/5=-100 tickets/ dollar.
therefore we shall have:
q(p)=5000-100(p-250)=3000-100p

the revenue for each price will be:
r(p)=p×q(p)=p(30000-100p)

next we get the total cost which is:
100×q, where q is the number of people who will fly.
but q=30000-100p
hence
c(p)=100(30000-100p)

the profit will be:
Profit=revenue-cost
=r(p)-c(p)=p(30000-100p)-100(30000-100p)
this will be written in quadratic form as:
(p-100)(30000-p)
next we find p that maximizes the profit function
(p-100)(30000-p)=-p²+30100p-3000000
when you take the derivative of the above, the maximum point will be at p=200, this will give us the profit of:
p(200)=-200²+30100(200)-3000000=1000000

Answer:

Scenario II i.e. when the price of ticket is $[tex]$245[/tex] will generate the greatest profit for the airline

Step-by-step explanation:

Scenario I

[tex]5000[/tex] tickets are sold at $ [tex]250[/tex] per ticket

The total money earned by the flight agency is

Number of tickets x price of each tickets

[tex]= 5000 * 250\\[/tex]

[tex]= 1250000[/tex] dollars

Scenario II

The price of each ticket is reduced by $[tex]5[/tex]

The price of new ticket is

[tex]250 -5[/tex]

[tex]= 245[/tex] dollars

The new number of tickets sold after reducing the price is

[tex]5000+ 500\\[/tex]

[tex]5500[/tex]

The total money earned by the flight agency is

Number of tickets x price of each tickets

[tex]5500 * 245\\[/tex]

[tex]1347500[/tex] dollars

Scenario II i.e. when the price of ticket is $[tex]$245[/tex] will generate the greatest profit for the airline

If $8,500 is deposited in a compound interest account paying 3.9% interest annually, how much will be in the account after 12 years? Round your answer to the nearest cent.

Answers

$8,500/12 yr = $13,452.58

The formula for amount is given by:

[tex] A=P(1+\frac{r}{n})^{nt} [/tex]

Now we are given ,

Principal (P) =$8500

rate (r) =3.9% = 0.039

period of interest (n) =1 for compounded annually

time (t) = 12 years

Plugging these values in the formula,

[tex] A=8500(1+\frac{0.039}{1})^{1*12} [/tex]

Amount =$13452.5773053

Answer : There will be $13452.5773053 in the account after 12 years.

Balancing chemical equations lab answers is the number of total molecules on the left side of a balanced equation always equal to the number of total molecules on the right side of the equation?

Answers

Since no reaction creates or destroys atoms, every balanced chemical equation must have equal numbers of atoms of each element on each side of the equation. However, the number of molecules does not necessarily have to be the same.

The answer is
No, the total number of molecules can be equal or not

Yes, in a balanced chemical equation, the number of total molecules (or atoms) on the left side of the equation is always equal to the number of total molecules (or atoms) on the right side of the equation. This principle is known as the Law of Conservation of Mass.

The Law of Conservation of Mass states that in a chemical reaction, matter is neither created nor destroyed. This means that the total mass of the reactants must be equal to the total mass of the products. Since molecules are composed of atoms, the number of atoms of each element on the left side of the equation must equal the number of atoms of the same element on the right side of the equation.

To balance a chemical equation, coefficients are placed in front of the chemical formulas to ensure that the number of atoms of each element is the same on both sides of the equation. Balancing the equation ensures that the total number of molecules (or atoms) is conserved, maintaining the principle of the Law of Conservation of Mass. Therefore, in a balanced chemical equation, the number of total molecules on the left side is always equal to the number of total molecules on the right side.

COMPLETE QUESTION:

Balancing chemical equations lab answers is the number of total molecules on the left side of a balanced equation always equal to the number of total molecules on the right side of the equation?

on wednesday, 30 students went to after school tutoring. on thursday, 6 students went. what is the percent decrease in the numbers of students who went to toturing?

Answers

Answer:

the number decreased by 80%

Step-by-step explanation:

The percentage change can be computed using ...

percent change = ((new value)/(old value) -1) × 100%

Putting the given numbers into this equation gives ...

percent change = (6/30 -1) × 100% = -4/5 × 100%

percent change = -80%

A negative sign on the percent change means the change was a decrease. The number of students who went to tutoring decreased by 80%.

Answer:

thanks

Step-by-step explanation:

Find the absolute maximum and minimum of values of the set
d. f(x,y)= 2x^2+y^2-4x-2y+1 d={(x,y) | 0 <= 3, 0 <= y <= 2}

Answers

Find the critical points within the region:

[tex]f(x,y)=2x^2+y^2-4x-2y+1[/tex]
[tex]\implies\begin{cases}f_x=4x-4=0\implies x=1\\f_y=2y-2=0\implies y=1\end{cases}[/tex]

So (1, 1) is the only critical point of the function and it happens to fall within the rectangle [tex]D[/tex]. At this point, we get a value of [tex]f(1,1)=-2[/tex].

Now check along the boundaries for potential extreme values.

If [tex]x=0[/tex], then [tex]f(0,y)=y^2-2y+1=(y-1)^2[/tex], which has a maximum when [tex]y=2[/tex] and has a minimum when [tex]y=1[/tex]. So we have a potential extrema at [tex]f(0,2)=1[/tex] and [tex]f(0,1)=0[/tex].

If [tex]x=3[/tex], then [tex]f(3,y)=y^2-2y+7=(y-1)^2+6[/tex], with a max when [tex]y=2[/tex] and min when [tex]y=1[/tex]. So we have [tex]f(3,2)=7[/tex] and [tex]f(3,1)=6[/tex].

If [tex]y=0[/tex], then [tex]f(x,0)=2x^2-4x+1=2(x-1)^2-1[/tex], with a max when [tex]x=3[/tex] and a min when [tex]x=1[/tex]. So we have [tex]f(3,0)=7[/tex] and [tex]f(1,0)=-1[/tex].

If [tex]y=2[/tex], then [tex]f(x,2)=2x^2-4x+1=2(x-1)^2-1[/tex] again, with a max when [tex]x=3[/tex] and a min when [tex]x=1[/tex]. So we have, again, [tex]f(3,2)=7[/tex] and [tex]f(1,2)=-1[/tex].

So there are absolute maxima of 7 at (3, 0) and (3,2), and an absolute minimum of -2 at (1, 1).

the sales of lawn mowers t years after a particular model is introduced is given by the function y= 5500 in (9t+4) where y is the number of mowers sold how many mowers will be sold 3 years after a model is introduced

Answers

Given the sales of the mowers is modeled by y=5500ln(9t+4)
where t is the number in year, then the sales after t=3 will be:
f(3)=5500ln(9*3+4)
f(3)=5500 ln(31)
f(3)=$18,886.93

Cedric has $0.45 in his pocket which fraction of a dollar does Cedric have

Answers

Final answer:

Cedric has 9/20 of a dollar.

Explanation:

To find the fraction of a dollar that Cedric has, we need to convert $0.45 into a fraction with a denominator of 100, which represents cents. Since 1 dollar is equal to 100 cents, we can write $0.45 as 45 cents. So, Cedric has 45/100 of a dollar, which can be simplified to 9/20.

Other Questions

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