*** = 28

An accountant department at a recently opened mall has been having difficulty getting customers to pay the full amount of bills. Many customers are complaining that the bills are not correct and do not reflect what they have purchased. Hence, the department has decided to implement a statistical control chart in its billing process. Based on the collected data illustrated in Table 1, set up a statistical control chart based on average sample size of 118 bills, and determine the control limits for the control chart/s. Is the process under control or not?

Questions 1. An accountant department at a recently opened mall has been having difficulty getting customers to pay the full amount of bills. Many customers are complaining that the bills are not correct and do not reflect what they have purchased. Hence, the department has decided to implement a statistical control chart in its billing process. Based on the collected data illustrated in Table 1, set up a statistical control chart based on average sample size of 118 bills, and determine the control limits for the control chart/s. Is the process under control or not? *** Table 1. The dataset on the problem Table 2. Parameter set Weekly Number of Sum of the numbers Sample Sample working incorrect in your student ID number size bills 10-13 hours 33 14-18 21 1 45 100 19-23 28 2 40 28 150 24-28 35 29+ 3 30 115 30 48 22 120 5 48 105 In Table 1, the data expressed with *** differs depending on student ID. Ex: If a student ID number is 117203072 (the sum of the numbers is 23). "28" should be chosen from Table 2 and it should be written wherever *** are seen in Table I. d. 4