The graph above is the perfect example of a scatter plot. Scatter plots general measure one variable against another variable, unlike line graphs which measure a variable against time. Data points are graphed as dots, and then a trend line is drawn to show the trend in the data as well as the spread of the data. The graph above shows the income level of experienced workers. It shows a positive relationship between the years of experience of a worker and his income level, as the trend line increases toward the right along with data values.
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