regression equation

For a group of 10 army recruits, the weight (in lbs) and exercise capacity (in METS) were
recorded.

Weight: 125 159 150 161 178 182 191 200 224 250

Exercise
Capacity: 30 29 25 26 27 29 26 20 15 19

The regression equation to predict exercise capacity from weight was found to be: y = 43.81 - 0.105x

( choose the correct answer:)
A- The correlation for these variables was found to be r = -0.79, this tells us that:

1- For each additional pound of body weight, the exercise capacity decreases by
0.79 METS.


2- As the weight of a recruit increases, the recruit’s exercise capacity also tends
to increase.


3- As a recruit gains weight this causes his exercise capacity to decrease.


4- There is no linear association between body weight and exercise capacity.


5- As the weight of a recruit increases, the recruit’s exercise capacity tends to
decrease.

B_ Interpret the slope of the regression equation developed to predict exercise capacity from weight.

1-For each additional 0.105 MET of exercise capacity, the weight decreases by
one pound.

2- For each additional pound of weight, the exercise capacity increases by 43.81
METS on average.

3- For each additional pound of weight, the exercise capacity decreases by
10.5%.

4- For each additional pound of weight, the exercise capacity decreases by
0.105 METS on average.