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A researcher is going to use a t-test when they are wanting to test whether two statistical means, or proportions, are equal. They are wanting to compare the two means or proportions.

For example, a researcher might want to look at whether people who are allowed to sleep for only four hours will cause their scores on a certain standardized test will be significantly lower than those were were allowed to sleep for a full eight hours. The two groups would be scored and the means of the two groups would be compared using a t-test.

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