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Recall the study, reported in Exercise 7.8.1, in which Dora et al. (A-37) investigated spinal canal dimensions in 30 subjects symptomatic with disc herniation selected for a discectomy and 45 asymptomatic individuals (control group). One of the areas of interest was determining if there is a difference between the two groups in the spinal canal cross-sectional area (cm2) between vertebrae L5/S1. The data in the following table are simulated to be consistent with the results reported in the paper. Do these simulated data provide evidence for us to conclude that a difference in the spinal canal cross-sectional area exists between a population of subjects with disc herniations and a population of thosewho do not have disc herniations? Let a=.05



     Herniated Disc Group                                                   Control Group

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2.61    2.57    1.98    3.21   3.59                      3.72      4.30    2.87     3.87     2.73     5.28

1.60   1.80      3.90   2.56   1.53                      1.33      2.36    3.67     1.64     3.54     3.63

2.39    2.67     3.53   2.26   1.53                       4.26     3.08    3.32     4.00     2.76     3.58

2.05    1.19     3.01   2.39    3.61                      3.11      3.94   4.39      3.73    2.22      2.73

2.09     3.79    2.45   2.55    2.10                      5.02      3.62   3.02      3.15    3.57      2.37

2.28     2.33    2.81   3.70    2.61                      5.42      3.35   2.62      3.72    4.37      5.28

                                                                         4.97      2.58   2.25      3.12    3.43

                                                                         3.95      2.98   4.11      3.08    2.22

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