1. Store sales were measured using a test with a standard deviation of 15. We measured 20 stores with new sales training, and 20 without it. The experimental group had a mean of 130 and the control group had a mean of 123.

a) State the null and alternative hypotheses.

b) Determine whether the results are statistically significant ata= .05.

c) State your statistical decision.

d) Write your answer in proper APA notation.