Question: Could you help me with this answer? A department store manager wants to estimate the mean amount spent by all customers at this store at

Could you help me with this answer?

A department store manager wants to estimate the mean amount spent by all customers at this store at a 98% confidence level. The manager knows that the standard deviation of amounts spent by all customers at this store is $31. What minimum sample size should he choose so that the estimate is within $3 of the population mean?

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