In a study of the effect of amphetamine on water consumption, a pharmacologist injected four rats with
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(a) Use a t test to compare the treatments at α = 0.10. Let the alternative hypothesis be that amphetamine tends to suppress water consumption.
(b) Use a Wilcoxon-Mann-Whitney test to compare the treatments at α = 0.10, with the directional alternative that amphetamine tends to suppress water consumption.
(c) Why is it important that some of the rats received saline injections as a control? That is, why didn't the researchers simply compare rats receiving amphetamine injections to rats receiving no injection?
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Related Book For
Statistics For The Life Sciences
ISBN: 9780321989581
5th Edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
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