The Management of a Department Store Is Interested in Estimating

Multiple Choice

The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card. You are given the following information. ​ A point estimate for the difference between the mean purchases of all users of the two credit cards is

A) 20.
B) 2.
C) 260.
D) 15.