______ allows researchers to control the percentage of their sample that falls into a specific category.
A. Simple random sample
B. Convenience sample
C. Cluster sample
D. Stratified random sample
Answer: D
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Heroin users often report
a. the high as a euphoric rush. c. increased sex drive. b. increased hunger. d. all of these
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A. 3 B. 12 C. 23 D. 33
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