Scatterplot graphs are used to present measurements of two or more variables. The points are plotted, not joined, and the resulting pattern indicates the type and strength of the relationship between the variables. The bold line that crosses the middle of the graph is known as the trend line. This line tells the reader what kind of relationship the variables have. For example, this map has a positive correlation and the line shows that by running from the lower left corner to the upper right corner.
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