A year-long fitness center study sought to determine if there is a relationship between the amount of muscle mass gained y (kilograms) and the weekly time spent working out under the guidance of a trainer x (minutes.) The resulting least-squares regression line for the study is y = 2.04 + 0.12x.
We can see from the equation of the line that, as the weekly time spent working out x goes up,
A) muscle mass gained y tends to go up because the slope 2.04 is positive.
B) muscle mass gained y tends to go up because the slope 0.12 is positive.
C) muscle mass gained y tends to go down because the slope 0.12 is less than 2.04.
D) muscle mass gained y tends to go down, because the slope 0.12 is less than 52.

Question

Quizplus · Accepted Answer

The slope of the regression line is 0.12, which means that for every additional minute spent working out under the guidance of a trainer, the muscle mass gained on average increases by 0.12 kilograms. Therefore, choice B is correct.

A Year-Long Fitness Center Study Sought to Determine If There