The equation of a regression line for data collected in the interval [-2 , 2] is

Question

The equation of a regression line for data collected in the interval [-2 , 2] is y-hat = 1.3 - 1.4x. A request is made to predict the value of the response when x = 5. Which one of the following choice would be the best reply to this request?

A Positively state the value is -5.7. B Cautiously advise that the value is -5.7 because of stratification. C Cautiously advise that the value is -5.7 because of extrapolation. D Positively state that the value is -5.7 because the sum of the errors is zero outside the interval [-2, 2].

Explanation / Answer

C Cautiously advise that the value is -5.7 because of extrapolation. as 5 lies outside regression range of [-2,2]

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