1. A small pilot study is conducted to investigate the effect of a nutritional supplement on total body weight.Six participants agree to take the nutritional supplement.To assess its effect on body weight, weights are measured before starting the supplementation and then after 6 weeks.The data are shown below.Is there a significant increase in body weight following supplementation?Use a paired t-test at a 5% level of significance.
3. 1.df=_____ (2 points)
4. 2.Critical value: ______(2 points)
5. 3.Computed statistic:_____ (2 points)
6. 4.Based on comparing the computed statistic to the critical value which of the following is (are) true? (4 points)
7. a. There is significant evidence, alpha=0.05, to show that body weight increased following supplementation?
8. b. There is not significant evidence, alpha=0.05, to show that body weight increased following supplementation?
9. c. Statistically speaking the difference in initial weights and weights after 6 weeks is 0.
10. d. b and c.

subject initial weight weight after 6 weeks

1 155 157

2 142 145

3 176 180

4 180 175

5 210 209

6 125 126