Question

different video games showing drug usewere 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 85​sec, what does df​ denote, and what is its​ value

Answer 1

Your question is not complete, however, I have provided answers to it by suggesting that the question goes like this;

Twelve 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 85​sec, what does df​ denote, and what is its​ value

Answer:

df denote degree of freedom.

degree of freedom df is 11.

Explanation:

what does df​ denote?

df denote degree of freedom

To find it value,

we have twelve different video games showing drug use, then, it means that the sample size "n" is 12

the degree of freedom is 1 < n ( i.e, one less than sample size)

df = n -1 = 12 -1 = 11

So, degree of freedom df is 11.

Note; use your sample size to solve the question as I don't know the exact value you were given. Thanks.