A study is testing whether a new exercise program is related to weight loss in a sample of 75 adults. The mean difference in weight from the beginning of the study to 6 months after is -5.1 with a 95% confidence interval of (-11.2, 1.0). Use these results to test whether weight changed over the study period. Give the null and research hypotheses for the test. (2 points) Give an interpretation of the 95% confidence interval. (5 points) Can we conclude that the weight changed over the study period? Why or why not? (5 points)