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A medical researcher wants to determine the percentage of females who take vitamins. He wishes to be 99% confident the estimate is within 2% points of the true proportion. A recent study of 180 females showed that 25% took 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?

1 Answer

4 votes
B. i think is the answer
User Imhere
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