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?

Question

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?

Quizplus · Accepted Answer

The Answer of 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?

Consider the Control Chart Based on Control Limits μ0±2.575σ/n\mu _ { 0 } \pm 2.575 \sigma / \sqrt { n }μ0​±2.575σ/n​

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