A Grocery Store Has an Average Sales of $8000 Per

Multiple Choice

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 64 days of sales was selected.It was found that the average was $8300 per day.From past information, it is known that the standard deviation of the population is $1200.The correct null hypothesis for this problem is

A) μ < 8000.
B) μ ≤ 8300.
C) μ = 8000.
D) μ > 8300.