Consider the Control Chart Based on Control Limits $\mu _ { 0 } \pm 2.575 \sigma / \sqrt { n }$

question 62

Essay

Consider the control chart based on control limits $\mu _ { 0 } \pm 2.575 \sigma / \sqrt { n }$
a. What is the ARL when the process is in control?
b. What is the ARL when n = 4 and the process mean has shifted to $\mu = \mu _ { 0 } + \sigma$
?
c. How do the values of parts (a) and (b) compare to the corresponding values for a 3-sigma chart?

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