Quality management

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QUESTION 6 Delivery times of 250 randomly selected customers this month had an average of 6 hours. The standard deviation from this group was 1 hours. (a) Build a 90% two-sided confidence interval on the mean delivery time (b) Build a 99% two-sided confidence interval on the mean delivery time. (c) Is it possible that the average delivery time is 6.5 hours? Attach File Browse My Computer Browse Content Collection QUESTION 12 A process is in statistical control with mean = 199 and estimated standard deviation = 6. The control chart uses a sample size of n 4. Specifications are at USL = 208 and LSL = 192. The quality characteristic is normally distributed. (a) Calculate the capability indices - Cp Cpl. Cpu, and Cpk for the process. (b) Interpret your result. Attach File Browse Content Collection Browse My Computer QUESTION 13 Apply the Western Electric Rules to the chart. Is the process in statistical control? UCL LCL A Out of control, Rule #4 B. Out of control, Rule #2 OC in control D. Out of control, Rule #3 OE. Out of control, Rule #1