IOE366W13-Exam2-practice-sol

The variables are xacid extractable cations and

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Unformatted text preview: tions and y=exchangeable acidity/total cation exchange capacity. Fitting the regression function ̂ Note that n=12. Parameter ̂ ̂ Estimate (Coef) 0.8733 -0.3255 0.0448 ̂ yielded the accompanying computer output. Estimated standard deviation (SE Coef) 0.0421( ̂ 0.0316( ̂ 0.0319( ̂ a. Estimate the predicted response at x=0.001859. Answer) ̂ ̂ ̂ ,̂ ̂ ,̂ ̂ (cf. Example 13.7) b. Carry out a test to decide whether the quadratic term should be retained in the model at 0.05 level. Answer) The null hypothesis, The alternative hypothesis, The test statistic, ̂ ̂ The critical value, At significance level .05, we fail to reject the null hypothesis because the quadratic term should not be retained. (cf. Example 13.9) 4 of 7 . Therefore, IOE 366 Fall 2012 Practice c. Suppose that SST = 1.456923 and SSE =0.117521. Write down the null...
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