Question: Problem 3. The time to replace vehicle wiper blades at a service center was monitored using a mean and a range chart. Six samples of

Problem 3. The time to replace vehicle wiper

Problem 3. 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 1 3.06 .42 4 3.13 .46 2 3.15 .50 5 3.06 .46 3 3.11 .41 6 3.09 .45 Range a. Using the factors in Table 10.3, determine upper and lower limits for mean and range charts. b. Is the process in control? For Part b, draw the mean and the range charts using excel (preferred) or by hand

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