Thirty dash three different video games showing violence were observed. The duration times of violence (in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than 74 sec, what does df denote, and what is its value?
A. The sample size B. C. D.
B. The sample standard deviation.
C. The test statistic.
D. The number of degrees of freedom.
2. The value of df is:.