... association between numerical variables.

A scatterplot displays pairs of numbers. In this example, we have 300 pairs, one for each home. One element of each pair is the number of heating degree days and the other is the amount of natural gas. The scales of these variables determine the axes of the scatterplot. The vertical axis of the scatterplot is called the y-axis, and the horizontal axis is the x-axis. The variable that defines the x-axis specifies the horizontal location of a specific observation, and the variable that defines the y-axis specifies the vertical location of the same observation. Together, a pair of values defines the coordinates of a point, which is usually ...

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