Julie Schaufler & Dan Cantarella
When comparing two sets of data, you subtract one from the other to find the difference for every group in the set. These differences are the means of paired data. This is called the Paired T-Test. After finding the mean differences, we want to know how close to the true mean we are for the matched pairs. A Paired T-Interval constructs a confidence interval to estimate the mean difference between matched pairs of data.
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