Question

MINITAB was used to fit the complete second-order model
E(y) = β0 + β1x1 + β2x2 + β3x1x2 + β4x12 + β5x22
To n = 39 data points. (See the MINITAB printout on page 652.)
a. Is there sufficient evidence to indicate that at least one of the parameters β1, β2, β3, β4, and β5 is nonzero? Test, using α = .05.
b. Test H0: β4 = 0 against Ha: β4≠0. Use α = .01.
c. Test H0: β5 = 0 against Ha: β5≠0. Use α = .01.
d. Use graphs to explain the consequences of the tests in parts b and c.


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  • CreatedMay 20, 2015
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