16.59 Defective plastic mold. A company that manufactures plastic molded parts believes it is producing an unusually large number of defects. To investigate this suspicion. each shift drew seven random samples of 200 parts, visually inspected each part to determine whether it was defective, and tallied the primary type of defect present (Hart, 1992). These data are presented in the table.
a. Construct a p-chart for this manufacturing process.
b. Should the control limits be used to monitor future process output Explain.