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

Rejecting a true null hypothesis

Answer

Accepting the alternative hypothesis correctly

Answer

Rejecting the alternative hypothesis correctly

Question 2

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

Accepted Answer

One-way ANOVA

Answer

Two-sample t-test

Answer

Paired t-test

Answer

Chi-square test

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

Confidence level equals alpha

Answer

Confidence level equals alpha squared

Answer

Confidence level equals 2 times alpha

Question 4

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

Accepted Answer

The power of the test

Answer

The significance level

Answer

The confidence interval width only

Answer

The Type I error rate

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

Continuous data from two populations

Answer

Time series data from one population

Answer

Ordinal data from three populations

Question 6

What assumption must be verified before using a two-sample t-test to compare process means?

Accepted Answer

Data should be approximately normally distributed

Answer

Data must be categorical

Answer

Samples must be dependent

Answer

Sample sizes must be exactly equal