In an Effort to Estimate the Mean Dollars Spent Per

Multiple Choice

In an effort to estimate the mean dollars spent per visit by customers of a food store, the manager has selected a random sample of 100 cash register receipts. The mean of these was $45.67 with a sample standard deviation equal to $12.30. Assuming that he wants to develop a 90 percent confidence interval estimate, the upper limit of the confidence interval estimate is:

A) about $2.02
B) approximately $65.90
C) about $47.69
D) None of the above