Interpolation
Using the regression equation to estimate y for an x-value within the range of x-values in the original data.
Real World
A meteorologist uses a regression model built on 30 years of UK temperature data to estimate rainfall on a day with 18°C — a temperature well within the dataset's range.
Exam Focus
When justifying a prediction, explicitly state the x-value is within the data range — examiners expect you to identify it as interpolation, not just calculate.
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