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Homework answers / question archive / Question 1 0 / 2 pts The best estimate for a  population proportion is the value of p ^    True     False     Question 2 2 / 2 pts For a confidence level of 95%, the postive value for z α 2is     2

Question 1 0 / 2 pts The best estimate for a  population proportion is the value of p ^    True     False     Question 2 2 / 2 pts For a confidence level of 95%, the postive value for z α 2is     2

Statistics

Question 1

0 / 2 pts

The best estimate for a  population proportion is the value of LaTeX: \hat{p}p ^

  

True

   

False

 

 

Question 2

2 / 2 pts

For a confidence level of 95%, the postive value for LaTeX: z_{\frac{\alpha}{2}}z α 2is 

  

2.575

   

1.96

   

2.05

   

2.33

 

 

Question 3

2 / 2 pts

Given the 98% confidence interval for p:

0.540 < p < 0.580

 

The margin of error E is 

  

0.020

   

.560

   

.040

 

 

Question 4

2 / 2 pts

Given the 98% confidence interval for p:

0.540 < p < 0.580

 

The value of LaTeX: \hat{p}p ^is 

  

.560

   

.040

   

.060

 

 

Question 5

2 / 2 pts

Given the 98% confidence interval for p:

0.540 < p < 0.580

 

The best estimate of the number of items in the sample n is  

  

Cannot be determiend

  

3345

   

1200

   

2000

 

 

Question 6

2 / 2 pts

Suppose that a random sample of 1500 adults revealed that 954 of them had attended some college.

 

If we construct the 95% confidence level for the proportion of all adults then we have:

 

 

  

.604 < p< .668

   

.612<p < .660

   

.610< p < .658

 

 

Question 7

2 / 2 pts

Given the sample data below

 

LaTeX: \bar{x}  =  35.6;   
s= 6.2;       
      n=20x ¯ = 35.6 ; s = 6.2 ; n = 20

 

Then the 90% confidence interval for LaTeX: \mu μ

 

(assuming a normal population ) is 

  

31.6< LaTeX: \mu μ< 39.6

  

33.2 < LaTeX: \mu μ< 38.0

  

32.7< LaTeX: \mu μ< 38.5

 

Question 8

2 / 2 pts

Suppose that a n = 21 and that LaTeX: \alpha = 0.05α = 0.05.

Then the positive value of  value of LaTeX: t_{\alpha/2 } t α / 2

would be 

 

2.086

   

2.080

   

1.721

 

 

Question 9

2 / 2 pts

Given a 95% confidence interval for LaTeX: \mu μ:

 

100< LaTeX: \mu μ< 200,   then 

 

LaTeX: \bar{x}   x ¯  and  E would be 

  

150 and 350 respectively

   

100 and 20 respectively

   

150 and 50 respectively

 

Question 10

2 / 2 pts

Given a 90% confidence interval for the population standard deviation,

 

If n =  26 then the critical values  LaTeX: \chi_L^2χ L 2and  LaTeX: \chi_{_R}^2χ R 2are

  

13.120 and 40.646

  

14.611 and 37.652

 

16.151 and 40.113

 

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Answer Preview

Question 1

0 / 2 pts

The best estimate for a  population proportion is the value of LaTeX: \hat{p}p ^

Correct answer  

True

 You Answered  

False

 

 

Question 2

2 / 2 pts

For a confidence level of 95%, the postive value for LaTeX: z_{\frac{\alpha}{2}}z α 2is 

  

2.575

 Correct!  

1.96

   

2.05

   

2.33

 

 

Question 3

2 / 2 pts

Given the 98% confidence interval for p:

0.540 < p < 0.580

 

The margin of error E is 

Correct!  

0.020

   

.560

   

.040

 

 

Question 4

2 / 2 pts

Given the 98% confidence interval for p:

0.540 < p < 0.580

 

The value of LaTeX: \hat{p}p ^is 

Correct!  

.560

   

.040

   

.060

 

 

Question 5

2 / 2 pts

Given the 98% confidence interval for p:

0.540 < p < 0.580

 

The best estimate of the number of items in the sample n is  

  

Cannot be determiend

 Correct!  

3345

   

1200

   

2000

 

 

Question 6

2 / 2 pts

Suppose that a random sample of 1500 adults revealed that 954 of them had attended some college.

 

If we construct the 95% confidence level for the proportion of all adults then we have:

 

 

  

.604 < p< .668

 Correct!  

.612<p < .660

   

.610< p < .658

 

 

Question 7

2 / 2 pts

Given the sample data below

 

LaTeX: \bar{x}  =  35.6;   
s= 6.2;       
      n=20x ¯ = 35.6 ; s = 6.2 ; n = 20

 

Then the 90% confidence interval for LaTeX: \mu μ

 

(assuming a normal population ) is 

  

31.6< LaTeX: \mu μ< 39.6

Correct!  

33.2 < LaTeX: \mu μ< 38.0

  

32.7< LaTeX: \mu μ< 38.5

 

Question 8

2 / 2 pts

Suppose that a n = 21 and that LaTeX: \alpha = 0.05α = 0.05.

Then the positive value of  value of LaTeX: t_{\alpha/2 } t α / 2

would be 

Correct!  

2.086

   

2.080

   

1.721

 

 

Question 9

2 / 2 pts

Given a 95% confidence interval for LaTeX: \mu μ:

 

100< LaTeX: \mu μ< 200,   then 

 

LaTeX: \bar{x}   x ¯  and  E would be 

  

150 and 350 respectively

   

100 and 20 respectively

 Correct!  

150 and 50 respectively

 

Question 10

2 / 2 pts

Given a 90% confidence interval for the population standard deviation,

 

If n =  26 then the critical values  LaTeX: \chi_L^2χ L 2and  LaTeX: \chi_{_R}^2χ R 2are

  

13.120 and 40.646

 Correct!  

14.611 and 37.652

   

16.151 and 40.113