Which of the following types of attrition is specifically a threat to the external validity of a study?

A. homogeneous
B. heterogeneous
C. homogeneous and heterogeneous
D. unequal


Answer: A

Psychology

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What is the probability of a couple having two children in the following order: girl, boy?

a. .0625 b. .125 c. .25 d. .50

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The twentieth century's unique addition to the definition of old age is the idea of

a. dementia. b. ageism. c. inevitable decline. d. retirement.

Psychology

Which theory of color vision explains that coding one color in a pair, such as red, seems to block the other color, green, from coming through; thus, making it impossible to see a reddish green color?

a. three-opponent b. trichromatic c. opponent-process d. afterimage

Psychology

Salvatore has extreme perfectionism that often prevents him from completing tasks. He begins his rigid schedule at 6 a.m. and does not deviate from it, even when it would be helpful. Salvatore would most likely be diagnosed with which personality disorder?

a. obsessive-compulsive b. narcissistic c. histrionic d. avoidant

Psychology