The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the average proportion of correc responses has been 74 percent. Recently, IRS representatives have been receiving more training. On April 26 , the set of 25 tax questions were again asked of 20 randomly selected IRS telephone representatives. The proportions of correct answers were: 19,16,19,16,21,22,21,19,17,19,24,15,22,20,17,15,23,11,21,and21. a. What are the upper and lower control limits for the appropriate p-chart for the IRS? Use z=3. The UCLp equals and the LCLp equals (Enter your responses rounded to four decimal places. If your answer for LCL is negative, enter this value as 0) b. Is the tax information process in statistical control? Since there , the process is considered to be statistical control. is at least one proportion defective below the lower control limit are no data points outside of the control limits is at least one data point above the upper control limit is at least one proportion defective within the control limits