2. A study was undertaken to examine the prot Y per sales dollars earned by a construction company and its relationship to the size X1 of the construction contract {in hundreds of thousands of dollars) and the number X: of years of experience of the construction supervisor. Data were obtained from a sample of n = 18 construction projects undertaken by the construction company over the past two years. These data are presented in Table2, where yi, a\" and 32,-);- denote the prot, contract size, and supervisor experience associated with the construction, respectively. Denote 37.13 = 3731, 331-54 = {ft-2,2, Ii' = .'L'i'lii'g and Ii' = JEE'Ixi'g. Let Y = 50 + .lel + 52X2 + sxs + 4X4 + 13537:: + Xs + '3 be a full model. Using SAS, apply the Stepwise and 6,, methods to determine the best sub- model for the data. Clearly explain the reasons why you chose it as a best sub-model. Provide the SAS you used to answer. \f