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Determining and Adjusting Sample Size

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1. Your professional organization wants to survey graduates in your field. It wishes to take a random sample to estimate the proportion of graduates who feel they got an "excellent education" during their college study days. The executive director of the association has indicated the it would be desirable for 90% confidence interval to estimate the true proportion to within ±6%.
a. With no additional information, how large a sample size should the organization plan to take? (Show your work.)
b. If the executive director is pretty sure that the true proportion is less than 70%, what adjustments can be made to the sample size recommended above?
c. If the executive director is pretty sure that the fraction is less than 1/3, what adjustments can be made to the sample size recommended above.

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Solution Summary

This solution provides calculations in excel for determining and adjusting sample size.

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