4/6/2024 0 Comments Degree of freedom calculator![]() The graph below depicts the t-distribution for various degrees of freedom. The DF specifies the form of the t-distribution used by your t-test to get the p-value. As a result, the degree of freedom for a one-sample t-test is n – 1. When we have a sample and estimate the mean, we know that we have n – 1 degrees of freedom, where n is the sample size. Let’s return to our nasty example from before. The difference between the sample average and the null hypothesis value is statistically significant when using a one-sample t-test.
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