5.52. Potency of a drug. Eli Lilly and Company has developed three methods (G, R1, and...

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5.52. Potency of a drug. Eli Lilly and Company has developedthree methods (G, R1, and R2) for esti- mating the shelf life ofits drug products based on potency. One way to compare the threemethods is to build a regression model for the dependent variable,estimated shelf life y (as a percentage of true shelf life), withpotency of the drug (x1) as a quantitative predictor and method asa qualitative predictor.
(a) Write a ?rst-order, main effects model for E(y) as afunction of potency (x1) and method. SAS Output for Exercise5.51
(b) Interpret the ? coef?cients of the model, part a.
(c) Write a ?rst-order model for E(y) that will allow the slopesto differ for the three methods.
(d) Refer to part c. For each method, write the slope of the y –x1 line in terms of the ?’s.

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Multiple Regression AnalysisHere consider a regression modelbased on n observationswith kindependent variableand the dependent variable Yis shown belowSo the estimates of the model See Answer

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