t-TEst. :D

The document provides instructions for performing a paired samples t-test, which is used to compare the means of two correlated groups or samples that are measured on the same individuals before and after some intervention. It outlines the null and alternative hypotheses, defines the significance level, describes how to calculate relevant statistics like the mean difference and standard error of the mean difference, and how to use these values to compute the t-statistic and determine whether to reject or fail to reject the null hypothesis based on the critical t-value.