The following problem is considered in [1, Chapter 8,]. A
certain chemical process leads to a product 
and a by-product
. The yields of both products are thought to be related to the
temperature of the process, 
. Twelve experiments are performed
with different temperature settings (degrees fahrenheit) to study the
effect of temperature. The data are shown in table 1, and
plotted in Figure 1. In
performing the analysis, we transform the temperature measurements to
, where 177.86 is the mean temperature setting.
Figure 1: Yield of two products for a chemical process
