Chronic Hemodialysis and Anxiety. Patients who undergo chronic hemodialysis often experience severe anxiety. Videotapes of progressive relaxation exercises were shown to one group of patients and neutral videotapes to another group. Then both groups took the State-Trait Anxiety Inventory, a psychiatric questionnaire used to measure anxiety, where higher scores correspond to higher anxiety. In the paper “The Effectiveness of Progressive Relaxation in Chronic Hemodialysis Patients” (Journal of Chronic Diseases, 35(10)), R. Alarcon et al. presented the results of the study.

The following data are based on those results.

Relaxation tapes Neutral tapes 30 41 28 14 36 44 47 45 40 36 38 24 50 54 54 45 61 36 24 45 50 46 28 35 38 43 32 28 42 35 32 43 37 34 20 23 41 33 35 36 34 47 25 31 32 17 45 39 14 43 40 24 46 29 21 40 Do the data provide sufficient evidence to conclude that variation in anxiety-test scores differs between patients who are shown videotapes of progressive relaxation exercises and those who are shown neutral videotapes? Perform an F-test at the 10% significance level. (Note:

s1 = 10.154 and s2 = 9.197.)