Scatter Plots, like the one featured above are used to show the relationship between two variables. If the value of one variable increases, then so does the other this means that there is a positive relationship between the two variables. But if the value of one variable increases, then the other decreases then there is a negative relationship between the two variables. The trend line helps to show the relationship of the data. How closely the data fits to the trend line shows the strength of the relationship between the variables. The scatter plot above is comparing the relationship of household incoming during childhood to income during adulthood. The graph indicates that there is a positive relationship between the two variables, but because the data does not fit closely along the trend line. So if your household income was higher during childhood, than you are more likely but not guaranteed to have a higher income in adulthood.
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