Dependent/Independent Mean Cindy Smith For each situation: (1) State the groups being compared (2) State your test choice (t-test for dependent means or t-test for independent means) (3) Justify your choice. .7. In a study of the effect on diet on cholesterol, rats were fed several different diets. Of the 40 rats studied, 20 were fed a diet that had 5% added fiber from oat bran