Forty 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 78 sec, what does dfdenote, and what is itsvalue?

What does dfdenote?

A.

The test statistic

B.

The number of degrees of freedom

Your answer is correct.

C.

The sample size

D.

The sample standard deviation

The value of df is ______ ( Type an integer or a decimal. Do notround.)