Dr. Cooper wanted to know if different vitamins (Vitamin C, Vitamin E, Vitamin A

Question

Dr. Cooper wanted to know if different vitamins (Vitamin C, Vitamin E, Vitamin A, and Vitamin D) impact  student's math performance? Five students were assigned to each of the vitamin conditions (20 students total). After taking the vitamins for a week, the students were given a math test. Here is a summary of the results:

M vitamin C = 20.2    M vitamin E = 21.4    M vitamin A = 22 M vitamin D = 20.6

ANOVA Table

What is the effect size for this vitamin study? (use eta squared)

0.064

0.363

0.936

0.158

Source SS df MS F Between Treatments 9.75 3 3.25 0.36 Within Treatments 143.20 16 8.95 Total 152.95 19

Explanation / Answer

The correct answer is Option C. The effect size for this vitamin study is 0.936.

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