A group of cardiac physicians in southwest Florida have been studying a new drug designed to reduce blood loss in coronary artery bypass operations. Blood loss data for 114 coronary artery bypass patients (some who received a dosage of the drug and others who did not) are saved in the BLOOD 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 recorded by the physicians are (1) redo surgery, (2) post-op infection, (3) both, or (4) none.

a. Figure 2.5, generated using SPSS, shows summary tables for the two qualitative variables, DRUG and COMP. Interpret the results.

Data from figure 2.5

b. Interpret the Minitab output shown in Figure 2.6 and the SPSS output shown in Figure 2.7.

Figure 2.6

Figure 2.7

Transcribed Image Text:

Valid NO YES Total Valid BOTH INFECT NONE REDO Total Frequency 57 57 114 Frequency 6 15 79 14 114 DRUG Percent 50.0 50.0 100.0 COMP Percent 5.3 13.2 69.3 12.3 100.0 Valid Percent 50.0 50.0 100.0 Valid Percent 5.3 13.2 69.3 12.3 100.0 Cumulative Percent 50.0 100.0 Cumulative Percent 5.3 18.4 87.7 100.0