SOLUTION: I have 2 series, x 1,2,3,4,5,6,7,8,9,10,11,12 y 85,60,160,140,235,200,270,200,225,100,60,-140 What is the quadratic equation for above series ?

Question 23541: I have 2 series,

x 1,2,3,4,5,6,7,8,9,10,11,12
y 85,60,160,140,235,200,270,200,225,100,60,-140

What is the quadratic equation for above series ?
Thanks,

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Using the Quadratic Regression capability
of a TI-83 calculator the best-fit quadratic
is the following:
y = -8.0479x^2 + 93.8063x=36.93546
The R^2 for this quadratic model is 0.80 which
shows it is a pretty good fit.
Cheers,
stan H.
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