Question: Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and

Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges computed:

a. Using the factors in Table 10.3, determine upper and lower limits for mean and range charts.
b. Is the process in control?

Sample Mean Range Sample Mean Range 3.06 42 2 3.15 50 3.11 41 3.13 46 5 3.06 46 3.09 45

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