According to Chapter 4, menstrual pain
a. is largely psychological in origin.
b. is not significantly influenced by psychological factors.
c. is related to elevated prostaglandin levels.
d. is especially severe in women as they approach menopause.
C
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If Wanda makes an educated, precisely worded guess about the behavior of her friends in a specific situation, she is making a:
A. theory B. hypothesis C. principle D. manipulation of variables
Random assignment helps ensure
a. cohort effects. b. differences exist between treatment groups prior to the treatment. c. age effects. d. similarity of treatment groups prior to the treatment.
Initial impressions in original attraction are formed carefully over several dates
a. True b. False Indicate whether the statement is true or false
To study the effectiveness of a new anti-anxiety drug, researchers randomly assign equally anxious people to two groups, one getting Drug X and the other getting no drug. The researchers mistakenly conclude that Drug X works because people in the drug group show fewer signs of anxiety than the others. What is the mistake? a. They never introduced an independent variable
b. They did not create a placebo control group. c. They never did a pretest of anxiety symptoms. d. They did not operationally define what the experimental group was.