a. 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. (Do not leave any empty spaces; input a 0 wherever it is required. Do not round intermediate calculations. Round the final answers to 4 decimal places.) b. Is the process in control? No Yes