Question: What pattern do you see in Figure 9.15, a plot of the residuals from a least squares regression? What do you think might have caused

What pattern do you see in Figure 9.15, a plot of the residuals from a least squares regression? What do you think might have caused this pattern? Residuals 2 1 -2- -3- 0 10 20 30 40 50 60

Residuals 2 1 -2- -3- 0 10 20 30 40 50 60 70 80 90 100 X Figure 9.15

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