Which quality tool is used to determine the correlation between two variables?

Which quality tool is used to determine the correlation between two variables?

• A. Histogram
• B. Pareto Chart
• C. Scatter Diagram
• D. Flow Chart

Answer: (C)

To see how two variables relate, you plot one on the horizontal axis and the other on the vertical axis and look at the pattern of points. A scatter diagram shows whether there’s a relationship and what kind: an upward trend indicates a positive correlation, a downward trend indicates a negative correlation, and a random scatter suggests little or no correlation. It also shows how strong that relationship is by how tightly the points cluster around a straight line, and it can reveal outliers or nonlinear relationships. Histograms display the distribution of a single variable, Pareto charts highlight the most significant factors, and flow charts map the steps in a process, so they don’t directly show how two variables relate.

To see how two variables relate, you plot one on the horizontal axis and the other on the vertical axis and look at the pattern of points. A scatter diagram shows whether there’s a relationship and what kind: an upward trend indicates a positive correlation, a downward trend indicates a negative correlation, and a random scatter suggests little or no correlation. It also shows how strong that relationship is by how tightly the points cluster around a straight line, and it can reveal outliers or nonlinear relationships. Histograms display the distribution of a single variable, Pareto charts highlight the most significant factors, and flow charts map the steps in a process, so they don’t directly show how two variables relate.