For the independent variable, evaluate whether it is (a) a between- or a within-

Question

For the independent variable, evaluate whether it is (a) a between- or a within-subjects variable, and (b) a manipulated or a subject variable.

In a study of the effects of motivation on maze-running speed, 50 rats are tested in a 20-foot alley maze (i.e., no turns, just a straight run from one end to the other). Some rats perform the task after going 5 hours without food, others after going 10 hours without food, and others after going 15 hours without food. Rats are placed in the different conditions in such a way as to insure that the average weights of the rats in all conditions are equal.

Explanation / Answer

The independent random variable in this question - number of hours for which the rat is left without food before the task, is a manipulative variable decided by the person conducting the experiment.

So, independent random variable here is (b) a manipulated or a subject variable.

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