Department store sales-sample distribution analysis

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Reference no: EM1395132

A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past data, it is known that the standard deviation of the population is $27.00.

a. Determine the standard error of the mean.

b. What is the 95% confidence interval of the population mean?

Reference no: EM1395132

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