Question: The data below represent four different treatments (diets) that were fed to a sample of 28 healthy adults for 12 weeks. The dependent measure is weight loss (lbs). The research question is: Does diet impact weight loss in healthy adults?

Food Pyramid

(Control) Group Atkins Diet NutriSystem South Beach

6.6 10.1 12.3 8.1

4.7 5.0 10.4 9.9

8.7 7.8 4.5 7.0

2.9 4.8 8.9 10.9

1.1 12.7 7.2 11.8

3.3 3.0 14.5 6.2

5.4 4.5 8.4 6.6

a. Calculate and report the appropriate statistical test(s) for these data.

b. Provide a brief conclusion about the results of your analysis. [Hint: Answer the question of interest.]