Which one is NOT true of erectile disorder?
a. ED is primarily a result of psychological, not physical, factors.
b. About 20% of men over the age of 20 experience ED.
c. ED rarely occurs in men younger than 50.
d. The incidence of ED increases with age.
Answer: c. ED rarely occurs in men younger than 50.
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Guiding and teaching a child, which some associate only with punishment, is:
A. modeling B. discipline C. behavior modification D. moralizing
Which of the following statements is most true regarding home-based research?
A) External validity may be high, but internal validity can be compromised. B) Typically, internal validity is higher than in laboratory research. C) It is typically easier and quicker to obtain data in this context than in laboratory research. D) It's best to conduct home visits alone, bringing more than one person could be viewed as too invasive by the family.