Upper Control Limit= Lower Control Limit= Upper Control Limit R= Lower Control L

Question

Upper Control Limit=

Lower Control Limit=
Upper Control Limit R=
Lower Control Limit R= Refer to Table S6.1-Factors for for this problem Twelve samples, each containing five parts, were taken from a process that produces steel rods at Emmanual Kodzi's factory. and ranges were computed. The results were: The length of each rod in the samples was determin Sample Sample Mean Range Sample Sample Mean 14.702 14.704 0051 14.693 00429 14.708 0037 10 4.697 Range (in.) 0.021 0.058 0.039 0.038 0.054 0.044 7 14.701 14.707 4.695 14.703 14.701 0.048 11 6 14.697 0053 12 14.706 0.061 For the given data, the 14.7012 inches (round your response to four decimal places) Based on the sampling done, the control limits for 3-sigma i chart are Upper Control Limit (UCL)- inches (round your response to four deamal places) Enter your answer in the answer box and then click Check Answer Clear All parts remaininn pt:doExercise(2): 0 Type here to search

Explanation / Answer

Upper Control Limit=X-bar-bar + (A2 x R-bar)=14.701+0.577*0.046=14.728

Lower Control Limit=X-bar-bar - (A2 x R-bar)=14.701- 0.577*0.046=14.674

Upper Control Limit R=R-bar x D4=0.046*2.114=0.097

Lower Control Limit R= R-bar x D3=0.046*0=0

(for sub-group size n=5 the A2=0.577, D3=0, D4=2.114, these are standard value )

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