Problem A group of cardiac physicians in southwest Florida has been studying a new drug designed to reduce blood loss in coronary bypass operations. Blood loss data for 114 coronary bypass patients (some who received a dosage of the drug and others who did not) are saved in the BLOODLOSS file. Although the drug shows promise in reducing blood loss, the physicians are concerned about possible side effects and complications. So their data set includes not only the qualitative variable DRUG, which indicates whether or not the patient received the drug, but also the qualitative variable COMP, which specifies the type (if any) of complication experienced by the patient. The four values of COMP are (1) redo surgery, (2) post-op infection, (3) both, or (4) none

a. Figure 5 , generated by SAS, shows summary tables for the two qualitative variables, DRUG and COMP. Interpret the results.

b. Interpret the MINITAB and SPSS printouts shown in Figures 6 and 7 , respectively.

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The FREQ Procedure Cumulative DRUG Frequency Percent Frequency Cumulative Percent NO 57 50.00 57 50.00 YES 57 50.00 114 100.00 Cumulative COMP Frequency Percent Frequency Cumulative Percent BOTH INFECT 15 NONE 79 REDO 14 6534 5.26 6 5.26 13.16 21 18.42 69.30 100 87.72 12.28 114 100.00