### Home > CCA > Chapter 6 > Lesson 6.2.5 > Problem6-110

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. Homework Help ✎

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

1. Interpret R-squared in context.

First calculate R2 (r2). Note that R2 % is the amount of variability that can be explained by a linear relationship.

_____ percent of the variability in __________ can be explained by a linear relationship with _______.

81.5
fuel efficiency
weight

2. Interpret the slope in context.

Think about the units for the slope in this situation.