ASQ Six Sigma Black Belt 3

Question 1

A Black Belt notices that a control chart shows 8 consecutive points on the same side of the centerline. According to Western Electric rules, this indicates:

Accepted Answer

A special cause of variation

Answer

Eight or more consecutive points on one side of the centerline is a Western Electric run rule indicating a non-random (special cause) pattern.

Question 2

Which type of hypothesis test should be used when comparing the means of two independent groups with unknown and unequal variances?

Accepted Answer

Welch's t-test

Answer

Welch's t-test (two-sample t-test with unequal variances) is appropriate when comparing two independent group means with unequal variances.

Question 3

In regression analysis, what does the coefficient of determination (R²) measure?

Accepted Answer

The proportion of variance in Y explained by X

Answer

R² represents the proportion of total variation in the response variable explained by the predictor variable(s) in the model.

Question 4

A Six Sigma team wants to prioritize which defect types to address first. Which tool would BEST help visualize the cumulative impact of defect categories?

Accepted Answer

Pareto chart

Answer

A Pareto chart ranks defect categories by frequency and overlays a cumulative percentage line, enabling the team to identify the vital few causes.

Question 5

In the context of Lean Six Sigma, what does 'takt time' represent?

Accepted Answer

The available production time divided by customer demand rate

Answer

Takt time is the available production time divided by customer demand, setting the pace at which products must be completed to meet demand.

ASQ - American Society for Quality Certification Practice Test

ASQ - American Society for Quality Certification Practice Test

ASQ Six Sigma Black Belt 3