Question

thirty - four 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? what does df denote? a. the number of degrees of freedom b. the sample standard deviation c. the test statistic d. the sample size

Explanation:

In a t - test, the notation "df" is a standard abbreviation for "degrees of freedom". Degrees of freedom in a one - sample t - test (which is likely the case here as we are testing a claim about the population mean based on a sample) is calculated as \(n - 1\), where \(n\) is the sample size. Here, the sample size \(n=34\), so \(df=n - 1=34 - 1 = 33\). But the first part of the question is just about what "df" denotes, and among the options, "the number of degrees of freedom" (Option A) is the correct denotation.

Answer:

A. The number of degrees of freedom