Twenty different video games showing alcohol use were observed. The duration times of alcohol use (in seconds) were recorded.

1. When using this sample for a t-test of the claim that the population mean is greater than 89 sec, what does df denote?

A. The sample standard deviation

B. The number of degrees of freedom

C. The sample size

D. The test statistic

2. What is its value?

Degree of freedom = 19

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 20

For a t-test hypothesis it was claimed that the population mean is greater than 89 second.

1) df

Df denotes the degree of freedom.

The Degrees of Freedom refers to the number of values involved in the calculations that have the freedom to vary.

2) Degree of freedom = n - 1

where n is the sample size

Degree of freedom = 20 - 1 = 19