LSS Green Belt · PeopleCert · Analyze · Bank updated 2026-07-03
LSS Green Belt practice questions: Analyze
5 free questions from 30 on this area · answer and explanation for each · no sign-up
These 5 questions come from the Analyze section of our LSS Green Belt bank (30 questions on this area, which carries 20% of the real exam). Every question is original, with the correct answer explained and linked to the source it is drawn from.
1/5 · Analyze · easy
A Green Belt rejects the null hypothesis and concludes that a process change reduced cycle time, when in reality the change had no effect. What kind of error has occurred?
ASampling bias
BA Type I error, governed by alpha risk
CA confidence interval violation
DA Type II error, governed by beta risk
Show answer & explanation
2/5 · Analyze
A Green Belt has response-time data from two call-center teams, and a normality test shows the data are not normally distributed. She wants to compare the two teams' medians. Which hypothesis test should she use?
AMann-Whitney test
BChi-squared test
COne-way ANOVA
DTwo-sample t-test
Show answer & explanation
3/5 · Analyze · hard
A process has a population standard deviation of 8. With a sample size of 16, the standard error of the mean is 2 (8 divided by the square root of 16). If the Green Belt increases the sample size to 64 while sigma stays the same, what happens to the standard error of the mean?
AIt increases to 4, because larger samples introduce more variability into the estimated mean
BIt stays at 2, because sample size does not affect the standard error, only sigma does
CIt decreases to 0.5, because standard error falls in direct proportion to sample size
DIt decreases to 1, because quadrupling the sample size doubles the square root of n used in the denominator
Show answer & explanation
4/5 · Analyze
A Green Belt wants to compare cycle times across four production shifts to see if the shifts differ. The cycle-time data is strongly right-skewed and remains non-normal even after attempting standard transformations, and the team wants to compare the shifts' medians rather than assume equal variances. Which hypothesis test is most appropriate for this situation?
AOne-way ANOVA
BChi-squared test of independence
CKruskal-Wallis test
DTwo-sample t-test
Show answer & explanation
C is correct. When comparing three or more independent groups on a continuous measure that fails the normality assumption, the Kruskal-Wallis test is the go-to non-parametric alternative to one-way ANOVA because it compares rank-based distributions (effectively medians) rather than means. ANOVA, the t-test, and chi-squared each apply to different data structures or assumptions that do not fit this scenario.
↗ the IASSC Lean Six Sigma Green Belt Body of Knowledge (ILSSBOK, PeopleCert syllabus) — Analyze
5/5 · Analyze · hard
A scatter plot of two continuous process variables shows a clear U-shaped (curvilinear) pattern. The calculated Pearson correlation coefficient for this data is r = 0.04. What should the Green Belt conclude?
AThe data must contain measurement errors, because any real relationship between variables always produces a high Pearson correlation coefficient
BThe near-zero r value only rules out a strong LINEAR relationship; a strong nonlinear relationship may still exist, as the U-shaped scatter pattern suggests
CSince r is close to zero, there is no meaningful relationship of any kind between the two variables
DAn r value of 0.04 confirms that the two variables are statistically independent of one another
Show answer & explanation
B is correct. The Pearson correlation coefficient exclusively quantifies the strength of a linear association and can be near zero even when a strong, systematic nonlinear relationship (such as a U-shape) exists. Green Belts should always inspect the scatter plot visually rather than relying on r alone, since a low r does not mean 'no relationship' or 'independence.'
↗ the IASSC Lean Six Sigma Green Belt Body of Knowledge — Analyze
Other LSS Green Belt areas
The same kind of free sample for every other section of the LSS Green Belt bank:
Study Analyze with instant feedback
6 free questions · filter study mode by area and difficulty · error log with spaced repetition · no card, no dumps, no ads.
Create your free account →
ExamDeck is an independent study tool, not affiliated with, endorsed by, or sponsored by PeopleCert. LSS Green Belt and related marks are trademarks of their respective owners, used for identification only. Exam facts checked against official PeopleCert materials (as of September 2026); always confirm current details with the vendor before booking.