Lean body mass (your weight leaving out fat) helps predict metabolic rate (how many calories of energy you burn in an hour). The relationship is roughly a straight line. The least-squares regression line for predicting metabolic rate (y in calories) from lean body mass (x in kilograms) is y = 113.2 + 26.9x.
The slope of the regression line is
A) 113.2-that is, when x = 0, y = 113.2.
B) 113.2-that is, the mean metabolic rate is 113.2 calories per hour.
C) 26.9-that is, the mean metabolic rate is 26.9 calories per hour.
D) 26.9-that is, when lean body mass goes up by 1 kg, metabolic rate goes up by 26.9 calories.
E) 26.9-that is, when a person weighs 26.9 more kg, metabolic rate goes up by 1 calorie.

Question

Quizplus · Accepted Answer

The slope of the regression line represents the increase in y (metabolic rate) for every increase in x (lean body mass) by one unit. Therefore, when lean body mass goes up by 1 kg, metabolic rate goes up by 26.9 calories.

Lean Body Mass (Your Weight Leaving Out Fat) Helps Predict