What is the minimal sample size needed for a 95% confidence interval to have a maximal margin

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What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of error of 0.1:
(a) If a preliminary estimate for p is 0.25?
(b) If there is no preliminary estimate for p?

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Understanding Basic Statistics

ISBN: 9781111827021

6th Edition

Authors: Charles Henry Brase, Corrinne Pellillo Brase

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Question Posted: Feb 28, 2016 04:03 AM

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What is the minimal sample size needed for a 95% confidence interval to have a maximal margin

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