# Certified Lean Six Sigma Green Belt (CLSSGB) v4.0 (CLSSGB)

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Total 200 questions

To draw inferences about a sample population being studied by modeling patterns of data in a way that accounts for randomness and uncertainty in the observations is known as
____________________.

• A. Influential Analysis
• B. Inferential Statistics
• C. Physical Modeling
• D. Sequential Inference

The perfect sample size is the minimum number of data points required to provide exactly
6% overlap or risk if one wants a 95% confidence level.

• A. True
• B. False

Bias in Sampling is an error due to lack of independence among random samples or due to systematic sampling procedures.

• A. True
• B. False

The Central Limit Theorem helps us understand the ___________ we are taking and is the basis for using sampling to estimate population parameters.

• A. Analysis
• B. Kurtosis
• C. Risk
• D. Route

Hypothesis Testing can help avoid high costs of experimental efforts by using existing data.

• A. True
• B. False

Hypothesis Tests determine the probabilities of differences between observed data and the hypothesis being solely due to chance. This is determined based on the result of the
______________.

• A. Random acts
• B. P-values
• C. Standard Deviations
• D. R-values

It is a Type I error if we reject the Null Hypothesis when it is actually true.

• A. True
• B. False

Inferential Statistics is largely about Significance. There are both Practical and
_______________ Significance to consider during an analysis of data in a Lean Six Sigma project.

• A. Problematic
• B. Impractical
• C. Usable
• D. Statistical

Having an Alpha of .05 and a Beta of .10 are the most common risk levels when running a
Statistical test.

• A. True
• B. False

The Alpha level of a test (level of significance) represents the yardstick against which P- values are measured and the Null Hypothesis is rejected if the P-value is which of these?

• A. Less than the Alpha level.
• B. Greater than the Alpha level.
• C. Greater than the Beta and Alpha level.
• D. Less than one minus Alpha.
• E. Less than the power of one minus Beta.

A 1-Sample t-test is used when you want to compare the Median of one distribution to a target value.

• A. True
• B. False

A 1-Sample t-test is used to compare an expected population Mean to a target.

• A. True
• B. False

Unequal Variances can be the result of differing types of distributions.

• A. True
• B. False

Due to excessive pollution, GREEN Solutions Inc. is considering subsidizing public transportation to work for its employees. According to the manager it takes an average weekday commute of 39 minutes with a Standard Deviation of 7 minutes for the employees to get to work while they use their personal vehicles for their office commute while the management set a policy of not more than 40 minutes for their daily one-way commute. A survey conducted one day on 70 employees showed an average of 34 minutes commuting time using the metro public transportation system with a Standard Deviation of 21 minutes.
Assuming a Normal Distribution for the commute times by either personal or public transportation, which of these is true?

• A. The probability that they would arrive on time using personal vehicles is much higher than using the metro public transportation system (MPTS)
• B. The probability that they would arrive on time using the MPTS is much higher than using their personal vehicles
• C. The two probabilities are about the same excepting in one case the consistency is higher than the other
• D. We need to compile more data around weekends to incorporate for traffic differences
• E. When Standard Deviation is higher the probability goes down and so the MPTS is worse

According to a manager it takes an average weekday commute of 39 minutes with a
Standard Deviation of 7 minutes for the employees to get to work when they use their personal vehicles for their office commute while management set a policy of not more than
40 minutes for their daily one-way commute. A survey conducted one day on 70 employees showed an average of 34 minutes commuting time using the metro public transportation system with a Standard Deviation of 21 minutes. For the employees choosing to increase their chances to come on time using personal transportation their variation should be reduced to ___________?

• A. 1 minute
• B. 6 minutes
• C. 3.5 minutes
• D. Eliminate it to 0.0 minutes