Question 1
The correlation between the heights, in inches, and arm spans, in inches, of 30 adults is r = 0.88. If both variables are converted to centimeters, what is the new correlation?
AP Statistics Unit 5 review
Unit 5 is 10–20% of Section I, and one shared-context set of three questions on each exam is about regression.
| Weight | 10–20% of the multiple-choice section |
|---|---|
| Topics | 5.1 to 5.5 |
Interpretations to know
- Slope: for each one-unit increase in x, predicted y changes by b.
- Residual: actual minus predicted.
- r²: the fraction of variation in y explained by the line.
- Extrapolation beyond the data is risky.
Try 3 questions
Question 2
For a sample of used cars, the least-squares line predicting price (in dollars) from age (in years) is: predicted price = 21,400 − 1,650(age). What does the slope mean?
Question 3
A residual plot for a linear model shows a clear U-shaped pattern: positive residuals at both ends and negative ones in the middle. What does this indicate?
Next step
Questions people ask
Is inference for slope on AP Statistics in 2027?
No. Unit 5 covers describing and fitting linear relationships; inference for the slope was removed.