When designing a cross-sectional study with different age groups, a researcher is concerned
that cohort differences may influence his study results.
To ease his mind, he ensures that the
oldest participants ( age 80 ) are similar in intelligence, education, and social class to the
younger participants. What is the researcher's primary concern?
A) The older participants may not be representative of the same-aged people in the
community.
B) He relied on a nonprobability or convenience sample.
C) It is very difficult to measure intelligence in older people.
D) He should not have relied on a chain sampling method.
A
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The investigation of how behavior is strengthened by presentation of positive reinforcers (e.g., food) or withdrawal of negative reinforcers (e.g., shock) is best known as
a. classical conditioning. b. the method of savings. c. choice reaction time. d. operant conditioning.
A sweater looks blue because it has properties that a. reflect short wavelengths while absorbing longer wavelengths
b. reflect long wavelengths while absorbing shorter wavelengths. c. refract short wavelengths while absorbing longer wavelengths. d. refract long wavelengths while absorbing shorter wavelengths.
Which of the following statements is true?
A. Alcoholism and drug abuse are relatively new social problems B. Humankind has always had a desire to alter individual states of consciousness regardless of the potential for damage C. Drug policies that emphasize supply reduction immediately reduce violence. D. Scientific research has shown that addiction is a matter of weak moral character.
A full understanding of gender constancy occurs by which age?
A. 3 B. 5 C. 7 D. 9