A quality characteristic X follows a Normal
distribution with mean 100 and standard deviation 2 when the
production process is in control.
Part (a): Suppose that the lower and upper
specification limits are 94 and 106, respectively. What
is the percentage of produced product items that are
non-conforming, i.e., do not conform to the specification limits,
when the process is indeed in control?
Part (b): The management has decided to monitor
the process with and R control charts with
a sample size of 4. What should be the lower limit,
centerline and the upper limit for each of the two control
charts?