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2 years ago

14

A polling firm is conducting research on Internet use by calling the landline telephone of every tenth person listed in a local

phone book. What bias may exist in the method they are using to do the poll?

1 answer:

denis-greek [22]2 years ago

7 0

Younger people don't own landline telephones so you are limiting your voter demographic to older people by calling them more than younger people.

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A political scientist wants to know how college students feel about the Social Security system. She obtains a list of the 3456 u

Marina CMI [18]

Answer:

For this case the population is described as:

All the college students

And the political have a list of 3456 undergraduates at her college for the sampling frame.

The sample would be the 104 students who return the survey.

Is important to notice that since he know the information about her college she can apply inference about the parameter of interest just at her college and not about all the possible students of college.

Step-by-step explanation:

For this case the population is described as:

All the college students

And the political have a list of 3456 undergraduates at her college for the sampling frame.

The sample would be the 104 students who return the survey.

Is important to notice that since he know the information about her college she can apply inference about the parameter of interest just at her college and not about all the possible students of college.

For this case we can also find the non reponse rate since we know that the total of questionnaires are 250 and she got back just 104 answered

$Non-resp. = \frac{250-104}{250} = \frac{146}{250}= 0.584$

So we have a non response rate of 58.4 %

4 0

3 years ago

X+4x+6x=? please explain in detail

Stolb23 [73]

X+4x+6x=

All of the variables are x so you don't have to do anything

6x+4x=10x

there is still one x left
x = 1

10x+x = 11x

6 0

2 years ago

Please help ASAP thanks

hjlf

Answer:

x = 2.5 inches. Or

x = 5/2

Step-by-step explanation:

Length: 7 + 2x

Width: 5 + 2x

Note that you have to add x at each end of the picture and onto each part of the width.

The entire area is 120 square inches.

Formula

L*W = Area

(2x + 7)(2x + 5) = 120

Solution

4x^2 + 10x + 14x + 35 = 120 Subtract 120 from both sides. Add xs

4x^2 + 24x + 35 - 120 = 0

4x^2 + 24x - 85 = 0 Factor

(2x + 17)(2x - 5)

2x + 17 has no meaning. It will give - 8.5 which is not possible.

2x - 5 =0

2x = 5 Divide by 2

x = 5/2

x = 2.5

Note: I don't know which one the computer is looking for.

8 0

2 years ago

Read 2 more answers

I need help asap please!!!

Mashcka [7]

1. x = 118 2. x = -54 3. x = -54 4. x = -54

5 0

3 years ago

cynthia invests some money in a bank which pays 5% compound interest per year. She wants it to be worth over £8000 at the end of

exis [7]

Answer:

The smallest amount is $\£6,911$

Step-by-step explanation:

we know that

The compound interest formula is equal to

$A=P(1+\frac{r}{n})^{nt}$

where

A is the Final Investment Value

P is the Principal amount of money to be invested

r is the rate of interest in decimal

t is Number of Time Periods

n is the number of times interest is compounded per year

in this problem we have

$t=3\ years\\ A=\£8,000\\ r=5\%=5/100=0.05\\n=1$

substitute in the formula above

$8,000=P(1+\frac{0.05}{1})^{1*3}$

solve for P

$8,000=P(1.05)^{3}$

$P=8,000/(1.05)^{3}$

$P=\£6,910.70$

Round to the nearest pound she can invest

The smallest amount is $\£6,911$

6 0

3 years ago