Question: A random sample of shoppers at a convenience store are selected to see how much they spent on that visit. The standard deviation of the

A random sample of shoppers at a convenience store are selected to see how much they spent on that visit. The standard deviation of the population is $6.43. How large a sample must be selected if the researcher wants to be 99% confident of finding whether the true mean differs from the sample mean by $1.50?

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