Problem
Part 2 of 2 28 points Points: 0 of 1 Save Twenty-six different video games showing alcohol use were observed. The duration times of alcohol use (in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than $94 \mathrm{sec}$, what does df denote, and what is its value? What does df denote? A. The sample size B. The number of degrees of freedom C. The test statistic D. The sample standard deviation The value of df is $\square$. (Type an integer or a decimal. Do not round.)
Solution
Step 1 ：The df in a t-test usually denotes the degrees of freedom.
Step 2 ：The degrees of freedom for a sample is typically calculated as the sample size minus 1.
Step 3 ：In this case, the sample size is 26 (the number of video games observed), so the degrees of freedom would be 26 - 1 = 25.
Step 4 ：Final Answer: B. The number of degrees of freedom. The value of df is \( \boxed{25} \).
