Determine the critical value for a left-tailed test of a population mean at the α = 0.005 level of significancebased on a sample size of n = 30.
A) -2.756
B) -1.699
C) 2.756
D) 2.750

Question

Quizplus · Accepted Answer

For a left-tailed test with α = 0.005 and a sample size of n = 30 (which means degrees of freedom = 29), we use the t-distribution because the population standard deviation is unknown. The critical value closest to the given significance level in t-distribution tables for df = 29 is -2.756.

Determine the Critical Value for a Left-Tailed Test of a Population