t-test

Twenty-nine 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 73 ​sec,

what does df​ denote, and what is its​ value? What does df​ denote?

A.The sample standard deviation

B.The number of degrees of freedomYour answer is correct.

C. The test statistic

D.The sample size

correct answer B

The value of df is 28.​

(Type an integer or a decimal. Do not​ round.