What tool is best for displaying the correlation of two characteristics?

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The best tool for displaying the correlation of two characteristics is a scatter diagram. This type of chart utilizes a Cartesian coordinate system to plot points, each representing the values of the two variables being analyzed. By examining the distribution of these points, observers can easily identify relationships, trends, and patterns between the two characteristics. For example, if the points on the scatter diagram tend to cluster in a straight line, it indicates a strong correlation, whether positive or negative.

In contrast, the other options serve different purposes. A fishbone chart is mainly used for identifying potential causes of a problem and organizing them systematically. A run chart is designed to track data points over time to understand trends, showing how a characteristic changes, but it does not directly display relationships between two variables. Lastly, a flow chart is primarily used to visualize processes or workflows, illustrating the sequence of steps rather than the correlation between variables. This distinction underscores why the scatter diagram is the most effective choice for correlating two characteristics.

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