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Checkout time in minutes at supermarket is monitored using a mean and a range chart. Six samples of n = 10 observations have been obtained and the sample means and ranges are computed as given in the

Checkout time in minutes at supermarket is monitored using a mean and a range chart. Six samples of n = 10 observations have been obtained and the sample means and ranges are computed as given in the table below

Sample No.

Mean

Range

1

4.50

0.54

2

4.45

0.55

3

4.40

0.46

4

4.55

0.58

5

4.48

0.48

6

4.60

0.49

 

Use this information to obtain three-sigma (i.e., z = 3) control limits for means of future time

  1. Determine the lower and upper control limits for the mean and range charts.
  2. Plot the sample means into mean control chart
  3. Plot the sample ranges in the range control chart
  4. Is the process in control?

Apr 15 2021 View more View Less

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