Suppose you fit the quadratic model E1y2 = b0 + b1x + b2x2 to a set of
Question:
Suppose you fit the quadratic model E1y2 = b0 + b1x + b2x2 to a set of n = 20 data points and found R2 = .91, SSyy = 29.94, and SSE = 2.63.
a. Is there sufficient evidence to indicate that the model contributes information for predicting y? Test using a = .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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Amrit Raj
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Related Book For 
Statistics For Business And Economics
ISBN: 9781292413396
14th Global Edition
Authors: James McClave, P. Benson, Terry Sincich
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