Exhibit 10-10 a Local Department Store Is Studying the Shopping Habits of Habits

Multiple Choice

Exhibit 10-10
A local department store is studying the shopping habits of its customers. They think that the longer customers spend in the store the more they buy. Their study resulted in the following information regarding the amount of time women and men spent in a store.

-Refer to Exhibit 10-10. The point estimate for the standard deviation of the difference between the means of the two populations is

A) 9
B) -1
C) -9
D) 1