Question

10. 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? Run the test at a 5% level of significance. Demonstrate the five steps for hypothesis testing and explain your results. 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

Answer 1

We will use paired t test:

Using Minitab:

Click Stat > Basic Statistics > Paired t... on the top menu, as shown below:

You will be presented with the following Paired t (Test and Confidence Interval) dialogue box:

Click the OK button. The output that Minitab produces is shown below.

P-value=0.607 > 0.05 we fail to reject null hypothesis.

At 5% level of significance there is no significance in body weight following supplementation.

Hope this will be helpful. Thanks and God Bless You :):)