 The different is about 3 inches of child’s height.</p>
<p>The model values are faithful to the data, but leave out the residuals. The raw data include the residuals. The non-zero size of residuals means that children of the shortest mothers differ in height from the model values. Similarly for the children of the tallest mothers. The result is, in the raw data, that some children of the shorter mothers are in fact taller than some children of the taller mothers. The model values, by stripping away the re