Psychologists evaluate whether theories are _____

Amphetamine was developed initially as a substitute for a closely related chemical derived from the Chinese herb ma huang. That chemical is

A. ephedrine. B. sympathamine. C. codeine. D. GHB.

Dr. Johan read a journal article that discussed the results of a study on the conversational patterns of men and women that was conducted with college student participants. He decides to repeat this experiment using middle-aged and older adults. In regard to the original study, Dr. Johan's study will be considered a(n)

a. operational revision. b. replication. c. confirmation bias. d. double-blind study.