Exhibit 9-9
the Sales of a Grocery Store Had an Average

Multiple Choice

Exhibit 9-9
The sales of a grocery store had an average of $8,000 per day. The store introduced several advertising campaigns in order to increase sales. To determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected. It was found that the average was $8,300 per day. From past information, it is known that the standard deviation of the population is $1,200.
-Refer to Exhibit 9-9. The correct null hypothesis for this problem is

A) $\mu$ < 8000
B) $\mu$ > 8000
C) $\mu$ = 8000
D) $\mu$ > 8250