Psychologists Wish to Evaluate the Consistency of a Standardized Behavioral

Multiple Choice

Psychologists wish to evaluate the consistency of a standardized behavioral test.The test is designed to have a variance of 225.Twenty randomly sampled tests yield a variance of 240.Assuming the underlying population is normal, what is a 90% confidence interval for the variance of this test?

A) (151.276, 450.727)
B) (12.300, 21.230)
C) (190.542, 328.899)
D) (138.803, 511.986)