Question: A normally distributed quality characteristic with specifications 49 + 4.0 is measured and Xbar and R values are calculated for each sample. After 50 samples

A normally distributed quality characteristic

A normally distributed quality characteristic with specifications 49 + 4.0 is measured and Xbar and R values are calculated for each sample. After 50 samples of size 9 we have 50 50 = 2500 and R, = 250 i = 1 i = 1 The process is in-control and d2=3.173 After the process is centered the Zbench would be? 3.17 O 2.87 3.44 2.29 4.63 1.98 2.97 O 1.46

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