The sales of a grocery store had an average of 8000 per day

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.

The correct alternative hypothesis for this problem is

m = 8000

m > 8250

m < 8000

m > 8000

Solution

H₁ : m > 8000

Because alternative hypothesis is the information we are testing. In this case it is, if sales are more than 8000 or not.