__________ permit(s) inferences about cause-and-effect relationships in experimental designs
A) Using treatment conditions that already exist in the real world
B) Manipulating or controlling changes in the dependent variable
C) Random assignment of participants to treatment conditions
D) Correlations between two or more variables
C
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Burns and Dunlop found that after a few years, the sadness and shock experienced by adolescents over their parents' divorce:
A) had greatly diminished. B) were still present for females. C) had increased. D) remained at the same levels.
When Elliot engages in intense exercise, particularly in cold weather or during allergy season, his bronchial tubes fill with mucus and contract. This causes him to cough and have serious breathing difficulties. Elliot has
A) nocturnal enuresis. B) asthma. C) emphysema. D) bronchitis.