In order to analyze possible differences between five treatments, a one-way
layout experiment was carried out. Each of the treatments was tested on three
machines, resulting in a total of 15 experimental runs. After fitting the one-way
model (2.1) (which has no block effect) to the data, the residuals were plotted
against machine number, as shown in Figure 2.8. What do you learn from the
plot? How would you modify your model and analysis?
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