What type of control chart should be used to study the above data? Answer: C-chart

The correct answer is A. C-chart. A C-chart is the correct choice when you are counting the number of defects (nonconformities) per inspection unit and the sample size (area of opportunity) remains constant across all samples - data that follows a Poisson distribution. Since only one option is visible here, the…

Control Phase

Question

What type of control chart should be used to study the above data? Answer:

C-chart

Options

AC-chart

How the community answered

(24 responses)

A
100% (24)

Explanation

A C-chart is the correct choice when you are counting the number of defects (nonconformities) per inspection unit and the sample size (area of opportunity) remains constant across all samples - data that follows a Poisson distribution. Since only one option is visible here, the distractors on the original exam likely included the U-chart (used when counting defects per unit but with varying sample sizes), the P-chart (used for the proportion of defective items, not raw defect counts), and the NP-chart (used for the number of defective items using a binomial model, not individual defects). The key distinction is defects vs. defectives: C and U charts count defects on a unit, while P and NP charts classify entire units as defective or not.

Memory tip: Think C = Count of defects, Constant sample size. If the sample size changes, upgrade to a U-chart ("U" for Unequal). If you're classifying whole units as pass/fail (not counting blemishes), switch to a P or NP chart.

Topics

#c-chart#count data#control chart selection#attribute data

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