In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is
A)22
B)23
C)60
D)61

Question

Quizplus · Accepted Answer

The number of degrees of freedom for a t-distribution is n-1, where n is the sample size. In this case, the sample size is 61, so the number of degrees of freedom is 61-1 = 60.

In Order to Determine an Interval for the Mean of a Population