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Math Help - Linear regression question

  1. #1
    Junior Member
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    Linear regression question


    For F, i find x is 11.5 then to calculate the CI
    we're given this formula for question it's

    then we use that SDx and times it by the tcrit for the confidence interval
    buttt
    im getting a confidence interval of 4.15, and that seems pretty massive.

    my b = 0.232, Sx/y = 0.275, n = 5, Sxx = 250, mean y = 2.482, Y=2.84
    is every thing im doing correct?
    alsooo im not sure what question e means, could anyone help me understand? do i just make n=6 instead of 5 ?
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  2. #2
    MHF Contributor matheagle's Avatar
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    THAT's the st for a PREDICTION interval
    take the one out and it's the st dev for a CI
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