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CMA Intermediate · Operations Management and Strategic Management · Productivity Management and Quality Management

A quality team plots daily temperature of a furnace against the number of cracked castings on the same day to check whether the two move together. The tool most suitable for this is the:

A scatter diagram is the right tool. It plots paired observations of furnace temperature and cracked castings so any positive, negative or absent relationship between the two variables can be seen, which check sheets and Pareto charts cannot show.

  1. ACheck sheet
  2. BScatter diagramCorrect
  3. CPareto chart
  4. DRun chart of defects only

Explanation

A scatter diagram plots paired observations of two variables to reveal positive, negative or no correlation. A check sheet only collects tally data, a Pareto chart ranks categories, and a run chart of defects alone ignores the second variable.

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