A psychologist notes that the higher a couple's socioeconomic and educational status, the smaller the number of children they are likely to have. This psychologist is describing a relationship called a
a. statistical significance.
b. standard deviation.
c. correlation.
d. normal curve.
ANSWER: c
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An artifact such as demand characteristics can threaten both the internal and the external validity of a research study
a. True b. False Indicate whether the statement is true or false
If researchers are interested in whether or not it is possible for a person to have a reaction time less than 0.05 seconds, and they simply measure the reaction times of volunteers who sign up for the study, what rationale would the researchers give for not using random sampling?
A) Sometimes generality does not matter. B) Sometimes generality cannot be determined. C) Sometimes generality can be determined. D) Sometimes generality is best determined by nonrandom sampling.
Solomon Asch's classic experiment (in which subjects judged a "standard" line and "comparison" lines) showed that subjects yielded to group pressure in about what proportion of the critical test trials?
a. one-tenth b. one-fifth c. one-third d. one-half
Jonathan, age 10, was born underweight because his mother smoked during pregnancy. Jonathan is at risk for
A) obesity. B) anorexia. C) bulimia. D) a fast basal metabolism.