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

Question

y=ax+b

a=-0.859

b=30.33

r2=0.394384

r=-0.628

Use this to predict the number of situps a person who watches 10 hours of TV can do (to one decimal place)

Answer 1

Just plug in x = 10 into the equation y = -0.859x + 30.33

y = -0.859(10) + 30.33 = 21.7