# Question

Referring to Exercise 8.20, regard the sample of 10 sales figures (which has standard deviation 32.866) as a preliminary sample. How large a sample of sales figures is needed to make us 95 percent confident that x-bar, the sample mean sales dollars per square foot, is within a margin of error of $ 10 of μ, the population mean sales dollars per square foot for all Whole Foods supermarkets?

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