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A residuals plot done correctly should appear:
AA clear straight line
BA perfect curve
CA repeating cycle
DRandom with no pattern
Answer & Solution
Correct answer: D. Random with no pattern
1. The scatter plot and the residuals plot are read for different things.
2. While a scatter plot of the data should resemble a straight line, a residuals plot should appear random.
3. It should show no pattern and no outliers.
4. A pattern in the residuals means the straight line has missed something systematic.
_Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 12 'Linear Regression and Correlation', sections 12.1-12.6_
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