Hemodialysis and anxiety. Severe anxiety often accompanies patients who must undergo chronic hemodialysis. A study was undertaken to determine the effects of a set of progressive relaxation exercises on anxiety in hemodialysis patients. The treatment group consisted of 38 subjects who were a set of progressive relaxation videotapes. The control group was made up of 23 patients shown a set of neutral videotapes. A psychiatric questionnaire that measured anxiety reveleaed the posttest results reported in Table 12.14. You want to test the mean difference for significance.TABLE 12.14 Posttest results. Group Mean Std. dev. Experimental 38 33.42 10.18 Control 23 39.71 9.16 Data from Alarcon, R. D., Jenkins, C. S., Heestand, D. E., Scott, L. K., & Cantor, L. (1982). The effectiveness of progressive relaxation in chronic hemodialysis patients, Table 1. Journal of Chronic Diseases, 35(10), 797-802