The mean of the sample means and the pooled standard deviation of 40 samples of size 5 taken from a production process under control are found to be 400 and 15,respectively.The lower control limit for the chart is:
A)460.37
B)392.88
C)379.88
D)None of these choices.

Question

The mean of the sample means and the pooled standard deviation of 40 samples of size 5 taken from a production process under control are found to be 400 and 15,respectively.The lower control limit for the  chart is:
A)460.37 
B)392.88 
C)379.88 
D)None of these choices.

Quizplus · Accepted Answer

The Answer of The mean of the sample means and the pooled standard deviation of 40 samples of size 5 taken from a production process under control are found to be 400 and 15,respectively.The lower control limit for the  chart is:
A)460.37 
B)392.88 
C)379.88 
D)None of these choices.

The Mean of the Sample Means and the Pooled Standard