IASSC Certified Lean Six Sigma Black Belt (ICBB) — Question 68

A(n) ______________ is best used to compare a Machine 1 average quality characteristic to the same quality characteristic of Machine 2.

Answer options

• A. F test
• B. 1-Sample t-test
• C. 2-Sample t-test
• D. ANOVA test

Correct answer: C

Explanation

The correct answer is C, the 2-Sample t-test, as it is specifically designed to compare the means of two independent groups. The F test is used for variances, the 1-Sample t-test compares a single sample to a known value, and the ANOVA test is for comparing means across three or more groups.