Sample means and ranges were obtained for five samples of 10 units per sample from a production process. Assume the process was considered to be in control during the period these samples were collected. The results are as follows:

LCL for the three sigma X chart for the process is approximately (for a sample size of 10, A₂ = 0.31) :

Question

Sample means and ranges were obtained for five samples of 10 units per sample from a production process. Assume the process was considered to be in control during the period these samples were collected. The results are as follows:

LCL for the three sigma X chart for the process is approximately (for a sample size of 10, A₂ = 0.31) :

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The Answer is A

Sample Means and Ranges Were Obtained for Five Samples of 10