Question: A 99% confidence interval for a population mean based on a sample of size 64 is computed to be (16.3, 18.7). How large a sample

A 99% confidence interval for a population mean based on a sample of size 64 is computed to be

(16.3, 18.7). How large a sample is needed so that a 99% confidence interval will specify the mean to within ±1.0?

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