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December 19, 2014

December 19, 2014

Posted by **JAY** on Wednesday, November 30, 2011 at 3:29pm.

Randomly selected cars were weighed, and the

highway fuel consumption amounts (in miles/gal) were determined. For 20 cars, the linear

correlation coefficient is found to be r = −0.874 and the equation of the regression line is ˆy

= 50.0 − 0.00628x, where x is the weight in pounds. Also, the 20 cars have a mean weight of

3232 lb and a mean highway fuel consumption amount of 29.7 mi/gal. What is the best

predicted value for the highway fuel consumption amount for a car that weighs 3500 lb?

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