Line graphs enable the viewer compare two variables with a simple visualization. One variable is plotted on the y-axis, minimum wage in this example, and one is plotted on the x-axis (year). The trend line connects the dots and allows one to see if a positive or negative correlation has been discovered. In this example, there is a clear correlation between time and the amount of minimum wage. This is a positive correlation because the trend line is starting in the lower left corner and headed towards the upper right corner. These map types are very useful and convenient when trying to notice a certain trend between variables.
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