The Paired t-Test (A.K.A. Dependent Samples t-Test, or t-Test for Correlated Groups)
https://www.powershow.com/view/423d80-YmRmO/The_Paired_t-Test_A_K_A_Dependent_Samples_t-Test_or_t-Test_for_Correlated_Groups_powerpoint_ppt_presentation
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