At what age is school effectiveness most likely to be related to extracurricular activities?

What is the acronym for the name of the personality inventory that measures grandiose narcissism?

a. MMP b. LNP c. PNI d. NPI

Mr. and Mrs. Thompson took their son Peter to a psychologist and were told that he was learning disabled. They later went to a psychiatrist for a second opinion and were told that Peter was mentally retarded. This demonstrates the problem of

a) high validity. b) stigmatization. c) unreliability. d) lack of validity.