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A school administrator is concerned about the amount of credit card

A school administrator is concerned about the amount of credit-card debt that college students have. She wishes to conduct a poll to estimate the percentage of full-time college students who have credit-card debt of $2000 or more. What size sample should be obtained if she wishes the estimate to be within 2.5 percentage points with 94% conﬁdence if

(a) A pilot study indicates that the percentage is 34%?

(b) No prior estimates are used?

(a) A pilot study indicates that the percentage is 34%?

(b) No prior estimates are used?

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