When constructing a confidence interval for the population mean using the standard deviation of the sample, the degrees of freedom for the t distribution equals
A) n - 1.
B) n.
C) 2n.
D) n + 1.

Question

Quizplus · Accepted Answer

The degrees of freedom for the t distribution when constructing a confidence interval for the population mean using the standard deviation of the sample equals n - 1. This is because when estimating the population standard deviation using the sample standard deviation, one degree of freedom is lost due to the calculation of the sample mean. Therefore, the degrees of freedom for the t distribution is n - 1.

When Constructing a Confidence Interval for the Population Mean Using