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Question 18 A utlility company sampled 537 customers, and finds that 103 of them had a...

Question 18

A utlility company sampled 537 customers, and finds that 103 of them had a discrpancy on their service bill. What is the upper bound for the 99% confidence interval for the proportion of customers with a discrepancy on their service bill?

Round to three decimal places (for example: 0.419). Write only a number as your answer.

Question 19

A pollster wants to construct a 95% confidence interval for the proportion of adults who believe that economic conditions are getting better. A Gallup poll taken in July 2010 estimates this proportion to be 0.33. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.039 ?

Write only an integer as your answer.

Question 20

A researcher wants to construct a 99% confidence interval for the proportion of people who changed jobs in the past year. What sample size is needed so that the confidence interval will have a margin of error of 0.063 ?

Write only an integer as your answer.

Math   Statistics-And-Probability   
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