A grocery store has an average sales of $8000 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 $8200 per day. From past information, it is known that the standard deviation of the population is $1500. The correct null hypothesis for this problem is
A. ?< 8000.
B. ?? 8200.
C. ? = 8000.
D. ?> 8200.
Answer: A
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