Sample diversity decreases external validity.
Answer the following statement true (T) or false (F)
False
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According to standard convention, a researcher must be ____ percent sure that the difference she observed between experimental conditions was not simply the result of chance in order to conclude that the difference is statistically significant
a. 90 b. 95 c. 99 d. 99.9
Six-year-old Hayley is afraid of being alone at night, doesn't like to be separated from her parents for long periods of time, hates thunder storms, and is afraid of witches who are "out to get her.". What should Hayley's parents know about Hayley's fears?
a. These fears are developmentally appropriate and should get better over time. b. Hayley has met the criteria for an anxiety disorder and should see a psychiatrist. c. These fears are excessive for a child her age and Hayley should see a psychiatrist. d. Hayley should be shielded from the things that she fears; otherwise, she is likely to develop an anxiety disorder.
Morphine is effective in relieving ____
a. pain on the skin b. sharp pain c. slow, dull pain d. pain in the interior of the body
Rotter's ideas about the person's locus of control:
a. have not received much research attention b. have generated hypotheses that have received strong empirical verification c. have generated hypotheses that have received little empirical verification d. have had little heuristic value