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Predict from a fitted model: interpolation and extrapolation

DIFFICULTYintrostandardchallengeexam
Question 1 of 8

Calculator allowed

The explanatory variable is vehicle age, measured in years, and the response variable is resale value, measured in hundreds of dollars

The observed vehicle age interval used to fit the model was 15–27 years, including both endpoints

\[\text{resale value} = 317 - 3\bigl(\text{vehicle age}\bigr)\]
(a)1 mark

Use the fitted model to find the resale value when the vehicle age is 21 years. Give a whole-number answer

Format: whole number
(b)1 mark

Classify the prediction for vehicle age 21 years

(c)1 mark

Use the fitted model to find the resale value when the vehicle age is 19 years. Give a whole-number answer

Format: whole number
(d)1 mark

Classify the prediction for vehicle age 19 years