91. The article Quantitative MRI and Electrophysiology of Preoperative Carpal Tunnel Syndrome in a Female Population (Ergonomics, 1997: 642—649)

reported that (473.3, 1691.9) was a large-sample 95% con dence interval for the difference between true average thenar muscle volume (mm3) for sufferers of carpal tunnel syndrome and true average volume for nonsufferers. Calculate and interpret a 90% con dence interval for this difference.