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Question 2 Four levels, coded as 3, 1, 1, and 3 were chosen for each of two variables X1 and X2, to provide a total of sixteen experimental conditions when all possible combinations (X 1, X 2) were taken. It was decided to use the resulting sixteen observations to t a regression equation including a constant term, all possible rstorder, secondorder, thirdorder and fourthorder terms in X1 and X2. The data were fed into a computer routine which ususlly obtains a vector estimate b : (x'xrlx'Y The computer refused to obtain the estimates. Why? The experimenter, who had meanwhile examined the data, decided at this stage to ignore the levels of variable X2 and t a fourthorder model in X1 only to the same observations. The computer again refused to obtain estimates. Why