Author note — to cover

Use a line of best fit to estimate one variable from the other for values inside the data range, reading in both directions, and comment on reliability via correlation strength and how close the value sits to the data. Estimates, never exact predictions. Going beyond the plotted range is the sibling extrapolation page. Both tiers. (S6)

• Fluency — direct questions on estimating with a line of best fit, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).