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262
6(DRAW)
a ...... Med-Med graph slope
b ...... Med-Med graph intercept
kk
kk
k Quadratic/Cubic/Quartic Regression Graph
P.254 A quadratic/cubic/quartic regression graph represents connection of the data
points of a scatter diagram. It actually is a scattering of so many points that are
close enough together to be connected. The formula that represents this is
quadratic/cubic/quartic regression.
Ex. Quadratic regression
3(X^2)
12345
6
6(DRAW)
Quadratic regression
a ...... regression second coefficient
b ...... regression first coefficient
c ...... regression constant term (intercept)
Cubic regression
a ...... regression third coefficient
b ...... regression second coefficient
c ...... regression first coefficient
d ...... regression constant term (intercept)
Quartic regression
a ...... regression fourth coefficient
b ...... regression third coefficient
c ...... regression second coefficient
d ...... regression first coefficient
e ...... regression constant term (intercept)
18 - 4 Calculating and Graphing Paired-Variable Statistical Data
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