Thread: 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 ?

THAT's the st for a PREDICTION interval
take the one out and it's the st dev for a CI