An organization wants to study the fraction of incorrect sales invoices that are sent to its customers. A random sample of 100 sales invoices was collected each week for 40 weeks. It reveals that the total number of incorrect sales invoices from all samples is 97
Calculate the fraction of incorrect sales invoices
Calculate the center line (CL), the upper control limit (UCL) and the lower control limit (LCL) for the control chart
What is your comment regarding the performance of the invoicing department if another sample that was taken later shows the number of incorrect invoices to be 105 invoices.