Ultrasound is one of many experimental treatments used for soft tissue injuries. In an experiment to gauge the efficacy of this treatment for knee injuries, seven subjects with recent knee injuries were enrolled in a trial. The range of motion (in degrees) of the joint was measured first. After a prescribed ultrasound treatment, the range of motion was measured again. Table 1 below contains the pre and post treatment responses from each of these subjects. I Table 1: Knee extensions (degrees) before and after ultrasound IPreI 46.5 | 46.2 | 48.7 | 40.9 52.0 41.7 41.3 IPostI 59.7 | 51.2 | 64.4 | 57.9 49.0 53.5 33.1 lDiffl | | | A) In the table above, enter the differences (computed Pre - Post) in the empty cells. B) Based on the sample, the average difference in the pre and post treatment responses is . (2 decimal places) C) The margin of error for a 98% confidence interval for the true average difference in knee extension before versus after ultrasound treatment is 11.59. Using this margin of error , determine the lower and upper limits for the confidence interval. Lower Limit: (2 decimal places) Upper Limit: (2 decimal places) D) Based on the results of this study, at a = 0.02 we can conclude that : There is NOT enough evidence to conclude that ultrasound affects the range of motion a