How to calculate UCL (Upper COntrol Limit) and LCL (Lower Control Limit)

[rana1india]

Production was sampled over a period of 28 days. Each day 50 items were sampled from the production. There were 407 items that were defective.

Please see the image and help.

 

[Bev D]

Is this a homework assignment?

 

[Miner]

Is this a homework assignment?

It certainly looks like one.

Production was sampled over a period of 28 days. Each day 50 items were sampled from the production. There were 407 items that were defective.

Please see the image and help.

Please describe your thoughts about how this question should be approached. Include any work that you have done. While we enjoy helping others, we also do not want to want to complete your homework for you. We will guide you in the right direction if you show effort.

 

[rana1india]

Yest it is for my son.

 

[rana1india]

I know the basic formula of UCL and LCL calculation. We are having problem deriving deviation.

 

[Miner]

Given the information provided, you first need to decide on the appropriate type of control chart. Not all control charts use the standard deviation to calculate the control limits. Consider whether an attribute control chart would be appropriate.