In developing an interval estimate of the population mean, if the population standard deviation is unknown _____.
A) it is impossible to develop an interval estimate
B) a sample proportion can be used
C) the sample standard deviation and t distribution can be used
D) None of the answers is correct.

Question

Quizplus · Accepted Answer

When the population standard deviation is unknown, we can use the sample standard deviation and a t distribution to develop an interval estimate of the population mean. This is known as the t-interval or the confidence interval for the mean. The t distribution takes into account the uncertainty introduced by using the sample standard deviation instead of the population standard deviation.

In Developing an Interval Estimate of the Population Mean, If