Lean Six Sigma Green Belt Certification FREE Lean Six Sigma Green Belt Basic Statistical Tools Questions and Answers 2

Question 1

Which measure of central tendency is most affected by extreme outliers in a data set?

Accepted Answer

Mean

Answer

The mean is calculated using all data values, so extreme outliers pull it significantly higher or lower.

Question 2

A process has a standard deviation of 3.5. What is the variance?

Accepted Answer

12.25

Answer

Variance is the square of the standard deviation, so 3.5² = 12.25.

Question 3

In a Pareto chart, what does the cumulative line represent?

Accepted Answer

The running total percentage of all categories combined

Answer

The cumulative line shows the running total percentage, helping identify the vital few categories that account for most of the effect.

Question 4

What type of data is represented by categories such as defect types or machine identifiers?

Accepted Answer

Attribute data

Answer

Attribute data (also called categorical data) classifies items into categories rather than measuring them on a numeric scale.

Question 5

When constructing a histogram, what does the height of each bar represent?

Accepted Answer

The frequency of data points within that interval

Answer

Each bar's height shows how many data points fall within that particular interval or bin.

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