Twenty-one different video games showing drug use were observed. The duration times of drug use (in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than 81 sec, what does df denote, and what is its value? What does df denote? A. The number of degrees of freedom OB. The sample size C. The sample standard deviation OD. The test statistic The value of df is (Type an integer or a decimal. Do not round.)