Researchers conducted a study to investigate some effects of physical training.2 The sample data provided below represent weights in kilograms before (pre) and after (post) training. The sample standard deviation of the differences between the pretraining and posttraining weights is 2.749. Using a 0.05 significance level, you need to test the claim that there is a difference between the pretraining and posttraining weights, i.e. that the mean value of the differences is not equal to 0. To do so, answer each of the following questions.

Pretraining 99 57 62 69 74 77 59 92 70 85

Posttraining 94 57 62 69 66 76 58 88 70 84

12. What conclusion should you make based on the given data?

a. Fail to reject H0 and conclude there is sufficient evidence to support the claim that there is a difference between the pretraining and posttraining weights.

b. Fail to reject H0 and conclude there is not sufficient evidence to support the claim that there is a difference between the pretraining and posttraining weights.

c. Accept H0 and conclude there is sufficient evidence to support the claim that there is a difference between the pretraining and posttraining weights.

d. Reject H0 and conclude there is sufficient evidence to support the claim that there is a difference between the pretraining and posttraining weights.

e. Reject H0 and conclude there is not sufficient evidence to support the claim that there is a difference between the pretraining and posttraining weights.