A medical researcher wishes to determine the percentage of females who take vitamins. He wishes to be
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Question:
A medical researcher wishes to determine the percentage of females who take vitamins. He wishes to be 99% confident that the estimate is within 2% percentage points of the true proportion. A recent study of 180 females showed that 25% look vitamins.
a. How large should the sample size be?
b. If no estimate of the sample proportion is available, how large should the sample be?
Related Book For
Elementary Statistics A step by step approach
ISBN: 978-0073386102
8th edition
Authors: Allan Bluman
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