In forming a 95% confidence interval for a population mean from a sample size of 20, the number of degrees of freedom from the t-distribution equals 18.

Question

Quizplus · Accepted Answer

The degrees of freedom for a t-distribution with a sample size of 20 should be 19, not 18. The correct formula for degrees of freedom for a t-distribution is df = n - 1. Therefore, the correct answer is B.

In Forming a 95% Confidence Interval for a Population Mean