ITPEC FE Morning October 2018 Question 78
ITPEC FE Morning October 2018 — Question 78 of 80
Scatter Diagram (Quality Control Tool) — A chart that plots two corresponding variables on X and Y axes to reveal correlation.
A scatter diagram places paired data points on two axes, each representing a different measured variable. It is used to visually assess whether a correlation exists between the two variables (positive, negative, or none).
The correct answer is d) Scatter diagram.
Why not the others:
- a) Control chart — plots a single variable over time with upper/lower control limits; used for process stability, not correlation between two variables.
- b) Histogram — displays frequency distribution of a single variable using bars; no paired data.
- c) Pareto chart — ranks defect causes in descending bar order with a cumulative line; focuses on prioritization, not correlation.
Key rule: When a question mentions "two corresponding types of data" on two axes with plotted measured values → scatter diagram. It is one of the 7 QC tools (七つ道具) used in manufacturing quality control.
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