Lean Six Sigma Black Belt Certification FREE Lean Six Sigma Black Belt Analyze Phase: Hypothesis Testing Questions and Answers 2

Question 1

In hypothesis testing, what does a Type II error represent?

Accepted Answer

Failing to reject a false null hypothesis

Answer

A Type II error (beta error) occurs when the test fails to reject the null hypothesis even though it is actually false.

Question 2

Which hypothesis test is most appropriate for comparing the means of three or more groups simultaneously?

Accepted Answer

One-way ANOVA

Answer

One-way ANOVA is designed to compare means across three or more groups to determine if at least one differs significantly.

Question 3

What is the relationship between confidence level and significance level (alpha) in hypothesis testing?

Accepted Answer

Confidence level equals 1 minus alpha

Answer

The confidence level is calculated as 1 minus alpha, so a 0.05 significance level corresponds to a 95% confidence level.

Question 4

When conducting a hypothesis test, what does increasing the sample size primarily affect?

Accepted Answer

The power of the test

Answer

Increasing sample size increases statistical power, making it more likely to detect a true effect when one exists.

Question 5

In a Lean Six Sigma project, a Black Belt uses a two-proportion test. What type of data is being analyzed?

Accepted Answer

Attribute data from two populations

Answer

A two-proportion test compares the proportion of occurrences (attribute/discrete data) between two groups.

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