Which of the following control charts is used to monitor discrete data?

The correct answer is A. p. Option A (p chart) is correct because the p chart monitors the proportion of defective items in a sample - data that is inherently discrete (each unit is either defective or not, a binary yes/no outcome). This makes it an attribute control chart, designed specifically for…

Control Phase

Question

Options

Ap
BI & mR
CX
DX and R

How the community answered

(35 responses)

A
89% (31)
B
9% (3)
C
3% (1)

Explanation

Option A (p chart) is correct because the p chart monitors the proportion of defective items in a sample - data that is inherently discrete (each unit is either defective or not, a binary yes/no outcome). This makes it an attribute control chart, designed specifically for count-based, non-continuous data.

The distractors - I & mR (B), X̄ (C), and X̄ and R (D) - are all variable control charts used for continuous measurements (e.g., temperature, weight, dimensions) where values can fall anywhere along a scale, not just in whole-number categories.

Memory tip: Associate the letter "p" with "pass/fail" or "proportion" - both are discrete concepts. If you're counting something that can only be one of two outcomes, reach for the p chart.

Topics

#p-chart#attribute control charts#discrete data#SPC

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