Suppose you fit the quadratic model E y 0
Suppose you fit the quadratic model
E(y) = β0 + β1x + β2x2
To a set of n = 20 data points and find that R2 = .91, SSyy = 29.94, and SSE = 2.63.
a. Is there sufficient evidence to indicate that the model contributes information relevant to predicting y? Test using α = .05.
b. What null and alternative hypotheses would you test to determine whether upward curvature exists?
c. What null and alternative hypotheses would you test to determine whether downward curvature exists?
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