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Home work assistance please! /: 3. How large a sample is needed to estimate the population mean for the amount of money a person spends

Home work assistance please! /:

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3. How large a sample is needed to estimate the population mean for the amount of money a person spends weekly on pastries within $3.50 and be 99% confident? The standard deviation of the population is $6.85. (What happened to the necessary sample size from #2?)

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