Prepare a quality control chart from the following sequential, monthly cycle-time data from the manu- Quality and Time Control facture of computer library devices. The desired level of performance is 140. The upper control limit is (LO 2,6)

160, and the lower control limit is 120. What does this chart indicate?

Month Average Cycle Time in Hours CA UA Memon rome Ment hints ee ces ceaentatas 124.0 Bey OUUET AUS ance cone Re Ree aE atte 175.0 ELC IR a fener Bc te int ssc a Bl ee aie ea 147.5 TANO UIT sce ost Rept eR BEC cECRU ERC eee NRE 97.0 MER: Soe ance pita sarah case eae ame RP Eee oeroe eee 1ootZ pSIUGTE a rte,c ame Met aloe RUA Bre ete ee 4 ON 132.0 ILUIIV7s, tae nce essen casaa nanan aetna tm erameane tat eto? rear e pe 228.0 PAU US ree nec serce te eater Siratianci settee sarc 152.0 SSC OLOUMOG Ipme reeatnes ecta te eMn PrUR 172.0

@elOWCheta R canetepei ec 112.0 INOVE MOG lexeren etoeeon Cha.ar ertisasn es aera 138.0