


Well, if the line is a good fit for the data then the residual plot will be random. However, if the line is a bad fit for the data then the plot of the residuals will have a pattern.
The residuals all have the same variance. Look for a random
scattering of points,
with no patterns in the plot. The vertical variation in the plot
should be roughly constant
throughout the whole range of fitted values.
Option F is correct.
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