Figure 1. Scatterplot of “Grades” Data from Minitab. The scaling is the default scaling used by Minitab.
Figure 2. Equal-Scales Scatterplot of “Grades” Data. Both scales are in standardized units.
Figure 3. Pointwise Contributions to the Correlation Coefficient. The average of these zxzy contributions is the correlation coefficient.
Figure 4. Regression Line and Point-Fit Line. The point-fit line is “closest” to the data points.
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