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(i) Test for the existence of regression (the F-test). Carefully de ne the null and alternative hypothesis, and explain the result of any R output you obtain.
(ii) Which of the 12 explanatory variables are not signi cantly associated with quality given that the other 11 variables are included in the model?
(iii) Fit the model using the 11 covariates that are signi cantly associated with quality. Calculate the R2 and adjusted-R2 value for your new model, and for the full model that used all 12 covariates. You should have found that R2 decreases upon removal of the unnecessary covariate, but that the adjusted-R2 increased. Explain this nding.
(iv) Carry out a partial F test to decide if inclusion of log(pH) provides a signi cant improvement over the model that just uses the 11 covariates. Repeat this analysis to decide whether adding (density) provides a signi cant improvement. Be sure to carefully de ne the null and alternative hypothesis and the procedure you use to do the test.
Verify how long $400 must be left to store at 12 % p.a. compounded monthly for it to amount to triple the soted value of another $400 deposited at the similar time at 8.8% p.a. com
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Below are the conditions specified by the institution: a) If the temperature sensor shows 30 degree Celsius or higher, the air-conditioner will be turned ON regardless of the othe
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Ah Fong borrow RM10 000. The yearly simple interest rate is 10.5%, payable monthly, and the monthly payment is RM200. How much of the 1st payment goes to interest and how much to p
y"+3y''+2y=0
As with the first order system, there is a general differential equation that governs the response of a second order system. The equation is of the form: Where: So
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