Question: 1. Explain plan-do-act cycle? (This question is from chapter 9) (5 points) 2. The time to replace vehicle wiper blades at a service center was

1. Explain plan-do-act cycle? (This question is from chapter 9) (5 points) 2. The time to replace vehicle wiper blades at a service center was monitored using a mean and range chart. Six samples of n=12 observations were obtained and the sample means and ranges computed: Sample Mean Range Sample Mean Range 1 3.08 0.44 4 3.13 0.44 2 3.14 0.50 5 3.09 0.48 3 3.12 0.44 6 3.07 0.46 a) Using the factors in Table 10.3(Textbook page 431) or statistical process control table, determine the upper limits and lower limits for mean and range charts (5 points) b) Is the process in control? Draw the mean and range charts to show whether the process is in control or not? (10 points)

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