A Complete Guide to Scatterplots, Regression, and Association Strength”

This document is ideal for students preparing for the AP Statistics exam, offering clear explanations, visual aids, and practice scenarios to reinforce understanding. Whether you’re analyzing bivariate data or interpreting regression output, this guide equips you with the vocabulary, formulas, and reasoning Scatterplots and direction of association (positive, negative, or no correlation) • Form and strength of relationships (linear vs. nonlinear, strong vs. weak) • Outliers and influential points • Correlation coefficient (r) interpretation and calculation • Least-squares regression line (LSRL) and its equation • Slope and y-intercept meaning in context • Residuals and how to assess model fit • Coefficient of determination (r²) and its role in explaining variability • Causation vs. correlation and common misconceptions