In an Experiment Aimed at Evaluating the Effect of a Memory-Enhancing

question 22

Multiple Choice

In an experiment aimed at evaluating the effect of a memory-enhancing drug on the recall of a previously learned response. Either the drug or a placebo was administered to different groups of rats before the memory test. There were three trials of the memory test, and the dependent variable was the time it took the animal to make the correct response.
It seems reasonable that there is some sort of relationship between the number of trials it took to learn a response and the speed of response on the test trials. It would be interesting to know how the drug affects this relationship. How might you go about looking at this question?

• A) Run a t test between the two groups' performance on the first test trial.
• B) Correlate the number of learning trials with the speed of performance on the test trials.
• C) Correlate number of learning trials and speed on test trials separately for the two drug conditions.
• D) Use the Mann-Whitney test to compare the groups.

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