For either gender, at least ____ percent of the variability in one's gender self-concept relates to environmental factors

According to Freud, the dreams of adults can be traced back to:

a. erotic wishes. b. stressful life events. c. physiological needs for brain stimulation. d. random bursts of neural activity.

A researcher is interested in how fussy babies get after spending time in a special machine she built. She asks two research assistants to rate the fussiness of each baby in the study. The two research assistants agree almost all of the time, giving her confidence about the _________ of the study.

a. test-retest reliability b. interrater reliability c. internal validity d. external validity