# Question

The manager of a newly opened Target store wants to estimate the average expenditure of his customers. From a preselected sample, the standard deviation was determined to be $18. The manager would like to construct the 95% confidence interval for the mean customer expenditure.

a. Find the appropriate sample size necessary to achieve a margin of error of $5.

b. Find the appropriate sample size necessary to achieve a margin of error of $3.

a. Find the appropriate sample size necessary to achieve a margin of error of $5.

b. Find the appropriate sample size necessary to achieve a margin of error of $3.

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