By the time that infants in developing countries (e.g., Cambodia, Mongolia, or Uganda) reach their first birthday, their height and weight is as low as the bottom ____ of infants of the same age in developed countries

At any stage of life, the three factors that combine to determine a person's developmental level are

a. heredity, cognitive style, and social grouping. b. heredity, environment, and cognitive style. c. environment, cognitive style, and the person's own behavior. d. heredity, environment, and the person's own behavior.

If a researcher reported for an independent-groups t test that t(12) = 3.66, p < .01, how many subjects were there in the study?

a. 12 b. 14 c. 13 d. 9