Question

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?

Answer 1

Degree of freedom = 19

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