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I attached a file for powerpoint 2007 ...
It depends on the sample size "n", see slide 4Darius...how do you obtain A2 & D4 from the tables?
I agree, but you have to start somewhere. If you have been tasked with charting a process, you often need to get on with it since your boss is not always willing to wait for you to gain the necessary knowledge to be an expert. I would hope that then that individual would recognize that their needs goes beyond the mechanics and must extend to the level of understanding. That understanding is not going to be found in this forum, as statistics need some fairly extensive study and training however we can help folks by giving folks a taste of what the statistics can tell them.Great post. I still bothers me to dump data into a chart without understanding if the chart - or the data - is adequate. It is just a bad way to look at SPC. Borders rubber stamp. That's why I posed the questions before posting the chart.
I agree, but you have to start somewhere. If you have been tasked with charting a process, you often need to get on with it since your boss is not always willing to wait for you to gain the necessary knowledge to be an expert.