- vu- vl-u- ....... In question 8.9, what is the conclusion of the statistical test? Answer: At alpha=5% level, fail to reject that there is no difference in mean anxiety score between two groups before the test. Can you explain how that answer is correct? Table 8.1 Pretest and Posttest State-Trait Anxiety means and standard deviations for the experimental and control groups of hemodialysis patients Pretest Posttest Mean sd :1 Mean sd n Experimental 37.51 10.66 38 33.42 10.18 38 Control 36.42 8.59 23 39.71 9.16 23 Note: A lower score on the test corresponds to less anxiety. Source: Reprinted with permission of the Journal of Chronic Diseases, 1982; 35(10); 797802. 8.9 Perform a statistical test to compare the experimental and control groups' pretest scores. 8.10 Perform a statistical test to compare the experimental and control groups' posttest scores