Question: Philadelphia s Sports Injury Center conducted a study to determine the
Philadelphia’s Sports Injury Center conducted a study to determine the relative effectiveness of four alternative rehabilitation programs designed for patients recovering from severe knee injuries. One of the variables used as an indicator of effectiveness is “number of days until the patient attains 75% of baseline lateral rotation.” Ten patients with similar injuries were randomly selected for each treatment. The partially completed tables below summarize results. Fill in the indicated missing values. Use the results to test a “no difference in average number of days” null hypothesis at the 5% significance level.
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