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What is the quadratic regression equation for the data set?





yˆ=−0.175x2−3.786x+121.119


​yˆ=−0.175x2+3.786x−121.119​


​yˆ=−0.175x2+3.786x+121.119​


​ ​ ​yˆ=−0.175x2−3.786x−121.119​ ​ ​

x y

6 100

3 110

10 50

3 90

5 120

15 30

9 70

Sagot :

ANGELLUCENA2007IN

Answer:

To get this you solve this set of equations

sum(x^4) a + sum(x^3) b + sum(x^2) c = sum(x^2y)

sum(x^3) a + sum(x^2)b + sum(x)c = sum(xy)

sum(x^2)a + sum(x) b + Nc = sum(y)