The IRS is concemed with improving the accuracy of tax information given by is reprosentafives ovor the telephone. Previous studies involved asking a sot of 25 questions of a farge number of IRS loiephone representatives to delermine the peoportion of correct responses. Historically, the average peoportion of correct responses has been 70 percent. Recenty, IRS representatves have been recelving more training. On April 28, the sot of 25 tax questions were again asked of 20 randomly solocted IRS telephone representafives. The proportions of correct answers wore: 15,21,19,16,21,15,21,20,17,20,23,11,23,21,19,16,23,16,21,and22. a. What are the upper and lower control limits for the appropriate p-chart for the IRS? Use z=3. The UCL, equals and the LCL, oquals (Enter your rosponses rounded to four docimat places. N your answer for LCL, is negasive, anter this valve as o) The IRS is concemed with improving the accuracy of tax information given by is reprosentafives ovor the telephone. Previous studies involved asking a sot of 25 questions of a farge number of IRS loiephone representatives to delermine the peoportion of correct responses. Historically, the average peoportion of correct responses has been 70 percent. Recenty, IRS representatves have been recelving more training. On April 28, the sot of 25 tax questions were again asked of 20 randomly solocted IRS telephone representafives. The proportions of correct answers wore: 15,21,19,16,21,15,21,20,17,20,23,11,23,21,19,16,23,16,21,and22. a. What are the upper and lower control limits for the appropriate p-chart for the IRS? Use z=3. The UCL, equals and the LCL, oquals (Enter your rosponses rounded to four docimat places. N your answer for LCL, is negasive, anter this valve as o)