Question

1 Customers of Dough Boy Ltd. have specified that pizza crusts they order should be 28–32 centimeters in diameter. Sample data recently collected indicate that Dough Boy ’s crusts average 30 centimeters in diameter, with a standard deviation of 1.1 centimeters. Is Dough Boy ’s pizza crust production system capable of meeting its customers’ requirements? a. Cp=1.566; the process is capableb. Cp=1.566; the process is not capablec. Cp=0.606; the process is capabled. Cp=0.606; the process is not capable

Answer 1

Answer: Cp=0.606; the process is not capable

Explanation:The process capability measure by process capability ratio,

Where,

and the process capability index,

Where,

Since,

Since the Cp=Cpk<<1, the process is making a significant number of defect hence process is not capable