Contoso Ltd. produces microchips. Five types of defects (labeled 1–5) have been known to occur. The chips are manufactured by two operators (A and B) using four machines (1–4).

You are given data about a sample of defective chips, including the type of defect, the operator, the machine number, and the day of the week the defect occurred. Use this data to chart a course of action that would lead, as quickly as possible, to improved product quality. You should use a PivotTable to “stratify” the defects with respect to the type of defect, day of the week, machine used, and operator working. You might even want to break down the data by machine, operator, and so on. Assume that each operator and machine made an equal number of products. You’ll find this data in the file Contoso.xlsx.