Suppose that an automotive parts and accessories chain is experimenting with a new sales promotion. Two similar stores are selected for the experiment. For Store 1, nothing changes. This store constitutes the control group. For Store 2, the treatment group, the promotion is implemented.
Sales in hundreds of dollars over a five-day period are as follows:
a. Control: 6, 6, 7, 10, 12, 9, 6, 5, 5, 7
b. Treatment: 2, 5, 2, 4, 7, 1, 2, 3, 4, 5
The expectation that sales will be higher in the treatment group makes this a one-tailed test; the alternate hypothesis is m1 < m2. Use Excel to determine whether differences between the two groups are statistically significant.
Show all of your work and clearly label each of your calculations. Share your calculations and your interpretations of your findings in your Word document.