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Math · Statistics And Probability
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Ultrasound (US) is one of many experimental treatments used to shorten the healing time 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 (US) 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

Pre 43.5 62.3 39.2 39.1 43.0 44.4 59.3

Post 54.1 54.8 45.2 49.2 37.3 36.0 43.9

Diff 10.6 -7.5 6 10.1 -5.7 -8.4 -15.4

B) The 90% confidence interval for the true average difference in knee extension after versus before US treatment is :

Low: ( )degrees to High:( )degrees

C) Based on the results of this study we can conclude that :

experiement provides no conclusive evidence that US affects the range of motion at all, the us treatment is affective in increasing range of motion, OR the us treatment is not affective in increasing range of motion. in fact it is decreasing

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