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Professor Hoffman Was Interested in the Effects of Vitamin B12

Question 158

Multiple Choice

Professor Hoffman was interested in the effects of vitamin B12 deprivation on maze learning in rats. One group is given a vitamin B12 injection. The comparison group is given a placebo injection. He finds that the vitamin group learns the maze faster. In this study, the independent variable is _______ and the dependent variable is _______.


A) speed of learning; type of injection
B) type of injection; speed of learning
C) vitamin B12; placebo
D) type of injection; number of errors
E) speed of learning; concentration of sugar

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