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.

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

Quizplus · Accepted Answer

The Answer of 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.

Sample Means and Ranges Were Obtained for Five Samples of 10