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Suppose that the standard deviation of the heights of five-year-old boys is 3.5 inches. How many five-year-old boys must be in a sample if we

Suppose that the standard deviation of the heights of five-year-old boys is 3.5 inches. How many five-year-old boys must be in a sample if we want to be 90% certain that the population mean height is estimated within 0.5 inches?

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