A medical facility does MRIs for sports injuries. Occasionally a test yields inconclusive results and must be repeated. Using the following 13 sample results for the number of retests in n = 200 observations each, construct a control chart for the proportion of retests using Two Sigma limits. Is the process in control?

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Sample 1 23 4 5 6 78 9 10 12 13 2 02 7 3 2 1 Number of retests 1 2 2 0 2