Suppose I am using the t-distribution to estimate or test the mean of a sample from a single population. If the sample size is 25, then the degrees of freedom are ____? I have an answer of 26 is this correct
df = n-1
df=n-k-1
n=number of observations
k=number of variables in the equation
No, your answer is incorrect. The degrees of freedom for estimating or testing the mean using the t-distribution is equal to the sample size minus one.
In this case, since the sample size is 25, the degrees of freedom would be 25 - 1 = 24.
Therefore, the correct number of degrees of freedom is 24, not 26.