1) Upper Control Limit?
2) Lower Control Limit?
From the data provided:
Mean of Xbar = Xbar-bar = Sum of all Xbar / Number of samples = 71.77/24 = 2.990
Rbar = Mean of R = Sum of R values / Number of samples = 24.62/24 = 1.025
Given that , sample size = n = 4
The relevant values of constants for n = 4 will be :
A2 = 0.729
Therefore, control limits for Xbar chart :
Upper Control Limit = UCLx = Xbar + A2.Rbar = 2.990 + 0.729 x 1.025 = 2.990 + 0.747= 3.737 inches
Lower Control Limit = LCLx = Xbar – A2.Rbar = 2.990 – 0.729 x 1.025 = 2.990 – 0.747 = 2.243 inches
1) Upper Control Limit? 2) Lower Control Limit? Sampling 4 pieces of precision-cut wire (to be...
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