(a)
To determine: The sample means and ranges, and whether this process is in control by using table 10.3. and mean and range charts when the time to replace vehicle wiper blades at a service center was monitored where 6 samples of n = 20 observations were collected.
Introduction: To monitor the process dispersion, range control charts are used and the mean control limit charts are based on a
(b)
To determine: The sample means and ranges, and whether this process is in control by using table 10.3 according to the given table of b when the n is 15.
Introduction: To monitor the process dispersion, range control charts are used and the mean control limit charts are based on a normal distribution.

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Chapter 10 Solutions
OPERATIONS MANAGEMENT CONNECT AC
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