In which tool and technique is it possible to find a correlation between dependent and independent variables?

Question

Options

• AFishbone diagram
• BControl chart
• CRun chart
• DScatter diagram

• A
  14% (4)
• B
  7% (2)
• C
  4% (1)
• D
  75% (21)

Explanation

Scatter diagrams are specifically designed to show the relationship between two variables - plotting one variable on the X-axis and another on the Y-axis to reveal whether a correlation exists (positive, negative, or none). This makes them the only tool in the list built explicitly for correlation analysis between dependent and independent variables.

Why the distractors are wrong:

• A. Fishbone (Ishikawa) diagram - identifies potential causes of a problem (cause-and-effect), not correlations between variables.
• B. Control chart - monitors process stability over time against control limits; it detects variation, not correlation.
• C. Run chart - plots data points over time to spot trends or shifts, but has no mechanism for comparing two variables against each other.

Memory tip: Think "scatter = scatter plot = two axes = two variables." The word "scatter" itself hints that you're spreading (scattering) data points across two dimensions to see if they cluster into a pattern - that pattern is the correlation.

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