Question

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).

The results of the regression were:

y=ax+b
a=-0.623
b=37.26
r2=0.386884
r=-0.622

Use this to predict the number of situps a person who watches 11.5 hours of TV can do (to one decimal place)

Answer 1

ANSWER::

where a=-0.623 b=37.26

The regression equation is

y = -0.623 (x) + 37.26

predict the number of situps a person who watches 11.5 hour(s) of TV can do

i.e. x =11.5 hours

y = -0.623(11.5) + 37.26

= -7.1645 + 37.26

= 30.09 ~~30

30.0 situps a person can do when he watches 11.5 hour(s) of TV

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