hypothesis for this problem? >7,9007,9008,100=7,900

7. DETAILS ASWSBE14 9.TB.3.025. MY NOTES ASK YOUR TEACHER A grocery store has an average sales of $ 7,900 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 100 days of sales was selected. It was found that the average was $ per day. From past information, it is known that the standard deviation of the population is $1,500. What is the correct null 8,100 hypothesis for this problem? o o o o g > 7,900 7,900 8,100 g = 7,900