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The confidence interval in the t-test indicates the range in which the mean difference lies. If different samples are drawn from a population, a parameter such as the mean difference will be different in each sample. The confidence interval indicates the range of fluctuation. The confidence interval in the t-test thus indicates the range in which the mean difference will lie with a certain probability. Here you can find the confidence interval calculator for the t-test: https://datatab.de/statistik-rechner/... More on the confidence interval: https://datatab.de/tutorial/konfidenz... Here you can find our book: https://datatab.de/statistik-buch #tTest #tDistribution #konfidenzintervall #Statistik