CPM Homework Help : CCA Problem 6-110

Consumer Reports magazine collected data for the fuel efficiency of cars (miles per gallon) compared to weight (thousands of pounds). The regression model below was created.

$y=49-8.4x$
$r=-0.903$

Interpret R-squared in context.
Hint 1(a):
First calculate R² (r²). Note that R² % is the amount of variability that can be explained by a linear relationship.
Hint 2(a):
_____ percent of the variability in __________ can be explained by a linear relationship with _______.
Answer (a):
81.5
fuel efficiency
weight
Interpret the slope in context.
Hint (b):
Think about the units for the slope in this situation.