Part 2 Calculation questions Question 1: Suppose that a critical dimension of the service quality of Special Product Company is the delivery time of an iWatch to its customer. Periodically, random samples of three delivery times are measured (in minutes). The results of last six sambles are in the followinn tahla a) Which control chart(s) should be chosen? Briefly justify your answer. b) Use 3 sigma control limits to develop the upper and lower control limits for the control chart(s) and judge whether the process is in control or not. Part 2 Calculation questions Question 1: Suppose that a critical dimension of the service quality of Special Product Company is the delivery time of an iWatch to its customer. Periodically, random samples of three delivery times are measured (in minutes). The results of last six samples are in the followina table a) Which control chart(s) should be chosen? Briefly justify your answer. b) Use 3 sigma control limits to develop the upper and lower control limits for the control chart(s) and judge whether the process is in control or not. c) Based on the data in part b), the specification for the delivery time is 450 minutes to 530 minutes, is the specification being met, calculate both cp and cpk ? Using the formulation =3nA2R ( n is the sample size) to estimate the standard deviation from average range