IASSC Certified Lean Six Sigma Black Belt (ICBB) — Question 25

Two samples are drawn from two normal types of population. Which of the following test statistics can be used to show that the two types of population have the same mean while both have the same variance?

Answer options

• A. F test
• B. Two sample pooled t-test
• C. Two sample z-test
• D. Two proportion z-test

Correct answer: A

Explanation

The F test is appropriate for comparing the variances of two populations to determine if their means are the same. The other options, such as the two sample pooled t-test and two sample z-test, require different assumptions about variances, while the two proportion z-test is not applicable for mean comparisons.