Question

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. Table 1: Knee extensions (degrees) before and after ultrasound 35.7 63.4 35.7 48.4 Pre 54.3 58.5 64.0 51.3 78.4 38.6 54.2 45.4 66.2 44.9 Diff .1 13.1 27.7 12.7 -2.2 27.1 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 -8.97 C) The margin of error for a 98% confidence interval for the true average difference in knee extension before versus after ultrasound treatment is 19.00. Determine the lower and upper limits for the confidence interval (2 decimal places) Lower Limit (2 decimal places) Upper Limit: (2 decimal places) D) Based on the results of this study, at α 0.02 we can conclude that: Select

Answer 1