SPC Data Collection & Interpretation 2

Question 1

A quality engineer wants to track the number of defects per unit on an assembly line. Which type of data is this?

Accepted Answer

Attribute data

Answer

Count of defects per unit is attribute (discrete) data because it represents countable occurrences rather than measured values.

Question 2

When collecting data for SPC, a rational subgroup is best described as:

Accepted Answer

A sample collected under the same conditions to minimize within-group variation

Answer

A rational subgroup is formed so that variation within the subgroup is minimized and only represents common cause variation, making between-subgroup variation easier to detect.

Question 3

Which sampling strategy is MOST appropriate when a process has known periodic cycles or patterns?

Accepted Answer

Systematic sampling aligned to cycles

Answer

Systematic sampling aligned with known cycles ensures the pattern is captured rather than aliased or missed during data collection.

Question 4

On a check sheet used for defect collection, a tally mark represents:

Accepted Answer

One occurrence of a specific event or defect type

Answer

Each tally mark on a check sheet records one occurrence, enabling easy frequency counts by category.

Question 5

A dataset has values: 10, 12, 11, 100, 13. The value 100 is most likely a(n):

Accepted Answer

Outlier that should be investigated before analysis

Answer

A value far removed from the others is an outlier and should be investigated for measurement error or a special cause before using the data.

(SPC) Statistical Process Control Certification Practice Test

(SPC) Statistical Process Control Certification Practice Test

SPC Data Collection & Interpretation 2