The Weaver–Dunn procedure with a fiber mesh tape augmentation is commonly used to treat AC joint (a joint in the shoulder) separations requiring surgery. The article “TightRope Versus Fiber Mesh Tape Augmentation of Acromioclavicular Joint Reconstruction” (Am. J. Sport Med. 2010: 1204–1208) described the investigation of a new method which was hypothesized to provide superior stability (less movement) compared to the W–D procedure. The authors of the cited article kindly provided the accompanying data on anteposterior (forward–backward) movement (mm) for six matched pairs of shoulders:

Carry out a test of hypotheses at significance level .01 to see if true average movement for the TightRope treatment is indeed less than that for the Fiber Mesh treatment. Be sure to check any assumptions underlying your analysis.

Transcribed Image Text:

Subject Fiber mesh TightRope 1 20 15 2 30 18 3 نیا 20 16 4 32 19 5 35 10 6 33. 12