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Residuals and Model Fit
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ACT Prep
ACTM.215 Residuals and Model Fit
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A model has the smallest mean absolute residual among four choices, but its residual plot shows a strong curve. What is the best next step?
A
Choose the model automatically because one summary number is always enough.
B
Change all negative residuals to positive predictions.
C
Check the residual pattern and consider a different model form, not just the single summary number.
D
Ignore the residual plot because graphs cannot show fit.
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