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 associated number of degrees of freedom for reading the t value is
A) 22.
B) 23.
C) 60.
D) 61.

Question

Quizplus · Accepted Answer

The degrees of freedom for a t-distribution when estimating a population mean with an unknown standard deviation is calculated as the sample size minus one. Therefore, with a sample size of 61, the degrees of freedom is 61 - 1 = 60.

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