Question: Here are residual plots (residuals plotted against predicted values) for three linear regression models. Indicate which condition appears to be violated (linearity, outlier or equal

Here are residual plots (residuals plotted against predicted values) for three linear regression models. Indicate which condition appears to be violated (linearity, outlier or equal spread) in each case.
a)

15 t 10 -5 -10+ -10 0 10 20 30 40 50 60 70 Fitted Value 50+ 40 30 20 10 -10 15.0 17.5 20.0 22.5 25.0 27.5 30.0 32.5 Fitted Value 200 100 -100 -200+ 00 200 300 400 500 600 700 Fitted Value

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