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For a biology project, you measure the weight in grams and the tail length in millimeters (mm) of a group of mice. The equation of the least-squares line for predicting tail length l from weight w is

l = 21 + 8 w

Now, if you measured the tail length in centimeters instead of millimeters, what would be the slope of the regression line? (There are 10 millimeters in a centimeter.)

 

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