If two dependent samples of size 20 are used to test the difference between the means,the degrees of freedom for a t-statistic is 19.

Name: If two dependent samples of size 20 are used to test the difference between the means,the degrees of freedom for a t-statistic is 19.
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The degrees of freedom for a t-test comparing two dependent samples is calculated as n - 1, where n is the sample size. For a sample size of 20, the degrees of freedom would be 20 - 1 = 19.

If Two Dependent Samples of Size 20 Are Used to Test