1. An accountant department at a recently opened mall has been having difficulty getting customers to...

 

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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 Weekly Number of working hours Sample number 1 2 3 4 5 45 40 30 48 48 incorrect bills *** 28 *** 22 *** Sample size 100 150 115 120 105 Table 2. Parameter set Sum of the numbers in your student ID 10-13 14-18 19-23 24-28 29+ *** 33 21 28 35 30 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 1. 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 Weekly Number of working hours Sample number 1 2 3 4 5 45 40 30 48 48 incorrect bills *** 28 *** 22 *** Sample size 100 150 115 120 105 Table 2. Parameter set Sum of the numbers in your student ID 10-13 14-18 19-23 24-28 29+ *** 33 21 28 35 30 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 1.

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