Author Question: True or False.When testing the utility of the quadratic model the most important tests involve the ... (Read 28 times)

future617RT · **on:** Feb 14, 2020

Question 1

The complete second-order model E(y) = β₀ + β₁x1 + β₂x2 + β₃x1x2 + β₄

+ β₅

was fit to n = 25 data points. The printout is shown below.

a.	Write the complete second-order model for the data.

b.	Is there sufficient evidence to indicate that at least one of the parameters β₁, β₂, β₃, β₄, and β₅

is nonzero? Test using

c.	Test H0: β₃ = 0 against Ha: β₃ ≠ 0. Use α = .01.

d.	Test H0: β₄ = 0 against Ha: β₄ ≠ 0. Use α = .01.

Question 2

True or False.

When testing the utility of the quadratic model

the most important tests involve the null hypotheses H0: β₀ = 0 and H0: β₁ = 0.
◦ True
◦ False

fur · **Reply #1 on:** Feb 14, 2020

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