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A Paired-Samples T Test is used to test if an observed difference between two means is statistically significant. To run a t test, the following conditions must be met: the data (1) has normal distribution, (2) is a large data set, and (3) has no outliers. If any of these conditions is not met, then a nonparametric test should be used. Created by the ITS Training Program at CSULA for students.

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