Mean, Standard Deviation, and CV 

Previous month's (or months') data 
This month's data 












Enter the control standard deviation:  
Enter the control limit you wish to evaluate (enter the multiplier number only, i.e. 2, 3, 3.5, etc.): 

Once you've entered these three values, click this button to calculate your limits  
Your Upper Limit will appear here:  
Your Lower Limit will appear here: 