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In an Experimental Test of the Effects of Vitamin B-12

Question 47

Multiple Choice

In an experimental test of the effects of Vitamin B-12 on problem-solving performance, ______ is the independent variable, and ______ is the dependent variable.


A) problem-solving performance; the vitamin
B) problem-solving performance; a placebo
C) the vitamin; problem-solving performance
D) a placebo; the vitamin

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