Extrapolation
Using the regression equation to estimate y for an x-value outside the range of x-values in the original data.
Real World
Tesla's early sales regression model, built on 2013–2016 data, badly overestimated 2030 global EV demand because the market structure changed — a classic extrapolation failure.
Exam Focus
Always conclude extrapolation answers with 'unreliable because the relationship may not hold outside the data range' — this evaluative phrase secures the final mark.
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