Which tool displays data points to reveal correlation between two variables?

Which tool displays data points to reveal correlation between two variables?

• A. Scatter Diagrams
• B. Flow Diagram
• C. Check Sheets
• D. Pareto Analysis

Answer: (A)

Visualizing the relationship between two quantitative variables by plotting each observation as a point on a two-axis graph shows how one variable changes as the other does. This scatter diagram lets you see patterns directly: a clear upward trend indicates a positive correlation, a downward trend a negative correlation, and a cloud with no clear direction suggests little or no correlation. It also helps spot outliers and differences between linear and non-linear relationships, guiding further analysis like fitting a line or calculating a correlation coefficient. The other tools serve different purposes—flow diagrams map steps in a process, check sheets tally occurrences, and Pareto analyses prioritize problems by frequency—so they don’t display the link between two variables with data points.

Visualizing the relationship between two quantitative variables by plotting each observation as a point on a two-axis graph shows how one variable changes as the other does. This scatter diagram lets you see patterns directly: a clear upward trend indicates a positive correlation, a downward trend a negative correlation, and a cloud with no clear direction suggests little or no correlation. It also helps spot outliers and differences between linear and non-linear relationships, guiding further analysis like fitting a line or calculating a correlation coefficient. The other tools serve different purposes—flow diagrams map steps in a process, check sheets tally occurrences, and Pareto analyses prioritize problems by frequency—so they don’t display the link between two variables with data points.