Plato, Aristotle, and Saint Augustine all described adolescence as a period that focuses on the struggle between

Dr. Swaminathan has recruited 100 participants to be in his study on personality traits. He

knows that many of them differ with respect to education, socioeconomic status and religion. To equally distribute these differences across the four groups he will use in his study, Dr. Swaminathan should a. assign subjects to groups using a counterbalancing procedure. b. randomly assign subjects to the groups. c. provide operational definitions for education, socioeconomic status, and religion. d. design the study so the effects of these variables on personality can also be measured. e. provide a valid operational definition of the dependent variable.

According to the Article Watching and Weighting, the explanation of the main findings that was most clearly demonstrated by the research was that intervention children:

(a) ate less (b) increased vigorous physical activity (c) wanted foods advertised on TV (d) did fewer sedentary activities