Chung and Hwang (2008) examined the difference between an experimental and a control group of patients with leukemia. The experimental group received two follow-up phone calls after discharge, and the control group received routine care. Their Table 2 is reproduced as Figure 9-11. FIGURE 9-11 Test of Two-Group Differences 4 Weeks After Discharge. Experimental Group Control Group (N=35) (N=35) Variable X SD X SD Self-care 2.67 0.36 1.78 0.38 10.347 Symptom distress 0.34 0.21 0.82 0.51 -5.158" Quality of life 70.46 18.76 44.15 16.01 6.074* "P