In a study of the influence of yogurt consumption and immunity (Van de Water, Keen, & Gershwin, Journal of Nutrition, 1999) there were three study groups per age group (young adults and senior adults). Live-culture yogurt, pasteurized yogurt and control (no yogurt) were given to each age group in portion sizes of 200 grams per day for 1 year. To which sets of data would you attach dummy variables when coding for a three-group experimental design?
A. The two groups given yogurt
B. The young adult age group
C. The senior adult age group
D. b and c
Answer: D
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