A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam has a standard deviation that is less than 5.0 minutes. A random sample of 15 students was selected and the sample standard deviation for the time needed to complete the exam was found to be 4.0 minutes. The degrees of freedom for this hypothesis test would be ______.
A)16
B)15
C)14
D)13

Question

Quizplus · Accepted Answer

The degrees of freedom for a hypothesis test regarding the standard deviation or variance is calculated as the sample size minus one. In this case, with a sample size of 15 students, the degrees of freedom would be 15 - 1 = 14.

A Professor Would Like to Test the Hypothesis That the Average