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A pharmacist is planning to estimate the mean level of a certain drug in a lab. The pharmacist wanted the estimate to be within 5

A pharmacist is planning to estimate the mean level of a certain drug in a lab. The pharmacist wanted the estimate to be within 5 mg/dLi or less with 90% confidence. The pharmacist also believes that the standard deviation of the drug level is probably about 45 mg/dLi.

How large a sample should the pharmacist need to take?

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