a regression was run to determine if there is a relationship betwen hours of TV watched per day (x) and number of situps a person can do

Question

the results of the regression were:

y=ax+b

a=-1.213

b=30.448

r²=0.654581

r=-0.889

use this to predict the number of situps a person who watches 4 hours of TV can do (to one decimal place)

Answer 1

The regression output gives you the form of the equation (y = ax + b), then gives you the values of a and b. So the regression equation is: y = -1.213x + 30.448.

To predict with the equation, substitute the value (in this case 4) for x and evaluate.

y = -1.213(4) + 30.448 ≈ 25.6 situps