Lean Six Sigma Black Belt (LSSBB) — Question 15

Following process modifications, the Null Hypothesis states that no improvement to the process has occurred. If we discover the Null Hypothesis Test was rejected when it was false that would be a(n) _______________.

Answer options

• A. Type I Error
• B. Type II Error
• C. Type III Error
• D. Alpha Error

Correct answer: B

Explanation

The correct answer is B, a Type II Error, which occurs when the Null Hypothesis is incorrectly accepted when it is false. A Type I Error (option A) happens when the Null Hypothesis is rejected when it is true, while Type III Error (option C) refers to correctly rejecting the wrong hypothesis, and Alpha Error (option D) is another term for Type I Error.