AP Statistics 5.4: Interpreting Residuals
Interpret a residual’s sign by deciding whether the regression model underpredicts or overpredicts the observed response in context.
- Syllabus
- Effective Fall 2025
- Course
- AP Statistics
5.4.B—Interpret the differences between the observed and predicted values question 1
A biologist gathered data on the length, in millimeters (mm), and the mass, in grams (g), for 11 bullfrogs. The data are shown in Plot 1.
From the data, the biologist calculated the least-squares regression line for predicting mass from length. The least-squares regression line is shown in Plot 2.
Official question visual
From Plot 2, consider the residuals of the 11 bullfrogs.
Does the least-squares regression line overestimate or underestimate the mass of the bullfrog identified in part (d-i)? Explain your answer.
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