A small pilot study

Average adult Americans are about one inch taller
September 27, 2019
Cummulative frequency
September 27, 2019

Question

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.

1. df=

2. Critical Value=

3. Computed statistic=

4. Based on comparing the computed statistic to the critical value which of the following

is (are) true? (4 points)

a. There is significant evidence, alpha=0.05, to show that body weight increased

following supplementation?

b. There is not significant evidence, alpha=0.05, to show that body weight increased

following supplementation?

c. Statistically speaking the difference in initial weights and weights after 6 weeks is 0.

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

 
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