Lean Six Sigma Green Belt Certification Measure Phase and Statistics 3

Question 1

In hypothesis testing, what does a p-value of 0.03 indicate when the significance level (α) is 0.05?

Accepted Answer

Reject the null hypothesis

Answer

When p-value (0.03) < α (0.05), we reject the null hypothesis, concluding there is a statistically significant effect.

Question 2

What is the primary purpose of a Process Failure Mode and Effects Analysis (PFMEA) in the Measure phase?

Accepted Answer

To identify and prioritize potential failure modes before they occur

Answer

PFMEA proactively identifies potential failure modes, their effects, and causes to prioritize risk reduction efforts.

Question 3

Which statistic is most resistant to the influence of outliers when describing the center of a dataset?

Accepted Answer

Median

Answer

The median is resistant to outliers because it is based on rank order, not the actual values of extreme data points.

Question 4

A Pareto chart is used in the Measure phase primarily to:

Accepted Answer

Identify the vital few causes contributing to most defects

Answer

Pareto charts apply the 80/20 rule to visually identify the few categories that account for the majority of problems.

Question 5

What is the Z-score for a data point that is 2 standard deviations below the mean?

Accepted Answer

-2

Answer

Z = (X - μ) / σ; a value 2 standard deviations below the mean yields Z = -2.

Lean Six Sigma Green Belt Certification Practice Test