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A researcher wishes to estimate, with 95% confidence

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Question

 A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think the

president of their country can control the price of gasoline. Her estimate must be accurate within 3% of the true proportion.
a) No preliminary estimate is available. Find the minimum sample size needed.
b) Find the minimum sample size needed, using a prior study that found that 40% of the respondents said they think their president can control the price of gasoline.
c) Compare the results from parts (a) and (b).

 
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In a survey of 9000 women, 6431 say they change their nail polish once a week.

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Question

 In a survey of 9000 women, 6431 say they change their nail polish once a week. Construct a 99% confidence

interval for the population proportion of women who change their nail polish once a week.

 
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In a survey of 2945 adults, 1473 say they have started paying bills online in the last year

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Question

In a survey of 2945 adults, 1473 say they have started paying bills online in the last year.
Construct

a 99% confidence interval for the population proportion. Interpret the results

 
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confidence interval

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Question

 Construct the indicated confidence interval for the population mean μ using

the t-distribution.

c=.90

x overbar =14.5
s=4.0

n=8

The 90% confidence interval using a t-distribution is

 
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