Exploring Two-Variable Data Overview — AP Statistics
1. Unit at a Glance
We build on your one-variable data skills to answer questions like: does studying more correlate with higher test scores? How do we predict home price from square footage? The unit follows a logical learning arc: start with visualizing relationships, measure the strength of association, build regression models, assess model fit, and handle special cases like non-linear data and influential points. We end with association analysis for categorical data.
Common Pitfalls
Why: Correlation only measures association; lurking variables can explain even strong relationships
Why: The regression line for predicting y from x is not the same as predicting x from y
Why: Weak correlation only means no linear relationship, not no relationship at all