Caffeine-producing plants are indigenous to __________
a. China
b. West Africa
c. North America
d. South America
e. all of these
e
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Research has consistently found that approximately ____ percent of American babies have secure attachment relationships
a. 60–65 b. 40–45 c. 80–85 d. 25–30
In Kettlewell's research, the proportion of dark-colored moths increased as _____ increased
a. pollution b. the use of outdoor lights c. dark-colored beetles d. the number of trees
Researchers have shown that teacher evaluations based on brief viewings of videotapes made by students who were not enrolled in a course correlate well with end-of-the-semester teacher evaluations made by students enrolled in the class. The researchers suggest that the relationship occurs because people can make relatively accurate judgments of affective behavior (e.g., likableness) very quickly because doing so is adaptive. Based on the correlational evidence alone, the researchers' explanation for their findings can best be considered
A. speculative. B. qualitative. C. a causal inference. D. a confirmed hypothesis.
Early-maturing adolescents of both sexes ________
A) often seek out younger peers B) excel in academic performance C) often seek out older companions D) report feeling little emotional stress