Section 2. Deliveries Suppose you work for a customer delivery department at a large furniture company. Company policy is to guarantee delivery within 3 days. Every day, three deliveries are picked (subgroup size n=3), and the time to delivery is recorded. (Note: Number of days to deliver = Delivery time - Invoice date). The results for the past month are in the following spreadsheet. For consistency of results with solutions, use R-bar method in Minitab to estimate within group standard deviation. Question 5 Which of the following would be the appropriate process capability index that includes the mean of the process and uses the within subgroup standard deviation based on an in-control process? Hint: Use Process Capability Analysis - Normal. a. St Dev = 0.75 b. Cpk = 0.36 C. Cp = 0.66 d. Ppk = 0.89