CQIA Data Collection & Analysis Methods 4

Question 1

Which of the following scenarios represents attribute data rather than variable data?

Accepted Answer

Classifying invoices as correct or incorrect

Answer

Attribute data classifies items into categories (pass/fail, correct/incorrect) rather than measuring on a continuous scale.

Question 2

A team notices their process data forms a skewed distribution with a long right tail. Which measure of center BEST represents the typical value?

Accepted Answer

Median, because it is less affected by the tail

Answer

In a skewed distribution, extreme values in the tail pull the mean away from the center, making the median a better representative.

Question 3

What is the purpose of a gage R&R study in quality improvement?

Accepted Answer

To evaluate whether the measurement system contributes excessive variation

Answer

A gage repeatability and reproducibility study quantifies how much of total variation is attributable to the measurement system itself.

Question 4

On a control chart, what does an upward trend of six or more consecutive increasing points indicate?

Accepted Answer

A potential special cause drifting the process upward

Answer

Six or more consecutive points moving in one direction is a trend signal indicating a possible special cause like tool wear.

Question 5

When should a team use a c-chart instead of a u-chart?

Accepted Answer

When subgroup sizes are constant and defects per unit are counted

Answer

A c-chart is used when the number of defects is counted in constant-size inspection units, unlike the u-chart which adjusts for varying sizes.

(CQIA) ASQ Certified Quality Improvement Associate Practice Test