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, which of the following is the margin of error that will be reported?

A) About ±$2.02
B) Nearly $50.20
C) $1.645
D) About $1.43