Question: 993, and .999, is the process in control The time to replace vehicle wiper blades at a service center was monitored using a mean and

993, and .999, is the process in control The time

993, and .999, is the process in control The time to replace vehicle wiper blades at a service center was monitored using a mean and a range chart. Six samples of n = 20 observations were obtained and the sample means and ranges computed: Sample Mean Range Sample Mean Range 1 3.06 .42 4 3.13 46 2 3.15 .50 5 3.06 .46 3 3.11 .41 6 3.09 .45 a. Using the factors in Table 10.3, determine upper and lower limits for mean and range charts. b. Is the process in control

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