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Math Help - Using linear regression information to make a prediction

  1. #1
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    Using linear regression information to make a prediction

    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=-0.864 b=37.082 r2=0.850084 r=-0.922
    Use this to predict the number of situps a person who watches 4.5 hours of TV can do (to one decimal place.

    I plugged in 4.5 into the equation and got 40.9. The answer is wrong. What am I doing wrong?
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  2. #2
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    Re: Using linear regression information to make a prediction

    Hey DasRabbit.

    Here is the results using R:

    > -0.864*4.5 +37.082
    [1] 33.194
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