CQIA Statistical Methods 4

Question 1

When constructing a Pareto chart, defect categories are ordered:

Accepted Answer

From most to least frequent

Answer

Pareto charts arrange categories from highest to lowest frequency to highlight the vital few contributors.

Question 2

What does a control chart's upper control limit (UCL) represent?

Accepted Answer

Three standard deviations above the process mean

Answer

The UCL is set at ±3 standard deviations from the mean, representing the expected range of common cause variation.

Question 3

A team notices that defect rates differ significantly between the day and night shifts. Which tool would best confirm this finding statistically?

Accepted Answer

Histogram comparison or hypothesis test

Answer

Comparing histograms by shift or running a hypothesis test quantifies whether the difference is statistically significant.

Question 4

Which of the following is an example of attribute data?

Accepted Answer

Pass/fail inspection result

Answer

Attribute data classifies items into categories (pass/fail, defective/not defective) rather than measuring a continuous scale.

Question 5

The standard deviation of a sampling distribution of means is called the:

Accepted Answer

Standard error of the mean

Answer

The standard error of the mean equals the population standard deviation divided by the square root of sample size.

(CQIA) ASQ Certified Quality Improvement Associate Practice Test