A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion of such...

A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion of such workers who have changed jobs within the past year.

A)In the absence of preliminary data, how large a sample must be taken to ensure that a 95% confidence interval will specify the proportion to within ±0.02? Round up the answer to the nearest integer.

Answer is not 2401

B) In a sample of 105 workers, 20 of them had changed jobs within the past year. Find a 95% confidence interval for the proportion of workers who have changed jobs within the past year. Round the answers to three decimal places.

The 95% confidence interval is (, ).?

C) In a sample of 105 workers, 20 of them had changed jobs within the past year. Estimate the sample size needed so that the 95% confidence interval will specify the proportion to within ±0.02. Round up the answer to the nearest integer.

Thank you!

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orchestra answered 1 year ago

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