Determine the critical value for a left-tailed test of a population standard deviation for a sample of size n = 21at the α = 0.05 level of significance.
A) 10.851
B) 11.591
C) 31.41
D) 32.671

Question

Quizplus · Accepted Answer

For a left-tailed test of a population standard deviation with n = 21 and α = 0.05, we use the chi-square distribution with n-1 = 20 degrees of freedom. The critical value is found using the chi-square table, which gives 10.851 for the 0.05 level of significance.

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