For a correlation of .5, the proportion of variance of one variable that is shared with the other variable is:
A) 25%
B) 50%
C) 55%
D) 60%
A
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Certain groups, such as children, college students, and prisoners, are considered __________ and IRBs require special procedures for studies using them as subjects
A) taboo B) especially desirable C) spurious D) protected
Sanderson and Alderson believe that a major difficulty with Lenski's surplus theory is his
a. underemphasis of the role of technology b. underemphasis of the role of social conflict c. excessive Marxian leanings d. view that people will automatically produce an economic surplus when they are technologically capable of doing so
At the beginning of the 1900s, life expectancy was:
a. about 75 years. b. about 60 years. c. less than 50 years. d. less than 30 years.
One of the most consistent and best-documented effects of cigarette smoking during pregnancy is ________ of infants.
A. nicotine withdrawal symptoms B. low birth weight C. mental retardation D. abnormal facial features