Sample Means and Ranges Were Obtained for Five Samples of 10

question 11

Multiple Choice

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) :

• A)10.12.
• B)10.05.
• C)10.94.
• D)9.44.
• E)9.75.

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