Hydraulic valves that are used in aircraft systems.

Janice is a production manager for a company that designs and produces hydraulic valves that are used in aircraft systems. The company is concerned that the number of valves not meeting the strict measurement parameters has increased over the past several months. She implements a quality control program that includes random inspections. Employees are notified that these inspections will help the company to reduce expenses from poor product quality. Janice runs the program for 9 months and performs a different number of inspection each month. (check the attachment for this table same info) The table below shows the number of inspections and the number of faulty hydraulic valves produced each month. Inspections Number of faulty valves 6 5 4 11 9 6 4 7 7 9 8 5 3 1 3 7 6 6.