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. What would be considered a useful set of planned contrasts?
A. contrast 1 = (control group) + (those having live-culture yogurt)contrast 2 = (those having live-culture yogurt) + (those having pasteurized yogurt)
B. contrast 1 = (control group) + (those having pasteurized yogurt)contrast 2 = (those having live-culture yogurt) + (those having pasteurized yogurt)
C. contrast 1 = (control group) + (those having live-culture yogurt + those having pasteurized yogurt)contrast 2 = (the group having live-culture yogurt) + (the group having pasteurized yogurt)
D. None of the above
Answer: C
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