When a significant number of subjects drop out of a study, there is a(n) ____ threat

a. history
b. mortality
c. instrumentation
d. regression

b

Psychology

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What percentage of fetuses present in the breech position?

a. 4% b. 20% c. 36% d. 50%

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The first attempt to employ probability theory in a practical setting was

developed in order to a. predict the results of presidential elections b. predict economic forces in the market place c. predict how consumers will evaluate new products d. make winning bets in the gambling casinos

Psychology