Author note — to cover

Explain the danger of extrapolating: extending a line of best fit beyond the plotted data assumes the trend continues, which the evidence cannot support. Question type: say why a specific prediction is unreliable, including one physically absurd case such as height continuing to grow with age. Estimates inside the range are the sibling page. Both tiers. (S6)

• Fluency — direct questions on the danger of extrapolation, 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).