In determining an interval estimate of a population mean when ? is unknown, we use a t distribution with _____ degrees of freedom.
A) $\sqrt { n - 1 }$
B) $\sqrt { n }$
C) n ? 1
D) n

Question

Quizplus · Accepted Answer

When estimating an interval of a population mean with an unknown standard deviation, a t-distribution is used with $n - 1$ degrees of freedom, where $n$ is the sample size.

In Determining an Interval Estimate of a Population Mean When n−1\sqrt { n - 1 }n−1​

In Determining an Interval Estimate of a Population Mean When $\sqrt { n - 1 }$