Question: Checkout time at a supermarket is monitored using a mean and a range chart. Six groups of 10 observations in each group have been obtained

Checkout time at a supermarket is monitored using a mean and a range chart. Six groups of 10 observations in each group have been obtained and the means and ranges for each group are computed as shown in the table below. Using the factors in Table 6.1(p.205) determine upper and lower limits for range charts. [Hint: Answer shown in (LCL, UCL)] (0.0,4.01)(0.27,3.73)(0.45,3.55)(0.0,4.56)(0.0,4.23)

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