36Covariance
We now turn our attention to some of the most widely used methods in the statistical tool kit. By the end of Part IV we will have constructed a statistical model that predicts peoples' weight (scaled data) based upon their height (scaled data) and their sex (binomial data). We'll start off by looking at a visual aid called a scatterplot (Figure 36.1). It paints a pointillist picture of the relationship between pairs of variables (
, 
). We'll make 
be peoples' heights and 
be peoples' weights. Each data point (
, 
) on the scatterplot is the height and weight of one person.
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