Apharmaceuticalclinicaltrial31 randomly assigned24patientstothreetreatmentgroups(drug A, drugC,placebo)andcomparedthemonameasureofrespiratoryability(FEV1 = forced expiratory volumein1second,inliters)after1houroftreatment.Forthe FEV data fileat the book’swebsite,fitthelinearmodelfor fev with explanatoryvariables base (the baseline measurementpriortoadministeringthedrug)and drug (categorical withlabels A, C, P). Show the fittedequationsbetweenfevandbaseforeachdrug,showhowtoconductanoveralltest for drug,andshowindividualtestscomparingeachpairofdrugs.