Simple linear regression
Read a fitted line, distinguish RMSE from R², then inspect residuals and extrapolation limits.
Helpful prior knowledge: Readiness · unfamiliar regression. These links are guidance, not locks.
Follow teaches the idea; Change asks you to make a choice; Transfer changes the context. Apply, reviews and checkpoints appear where the existing lessons provide them. Go Further lessons are optional.
Lessons in this model deck
Start with the first core lesson →
Read a fitted line
Interpret slope and intercept in context.
25–40 min · 4 practicesRMSE and R² answer different questions
Distinguish target-unit errors from relative fit.
12–18 min · 3 practicesRead residual patterns and limits
Use residual structure to question a fitted relationship.
12–18 min · 3 practices