The document below is a list of sample questions on Cp/Cpk. You can try to answer them and I’ll post the correct answers on December 15th. Remember in an exam situation write down as much info as possible. While you;ll get full marks for the Cp/Cpk value and telling me if the result is capable or not, if you get the answer wrong you’ll get nothing (if you only write the answer). So write out the formula and fill in the parts to the formula. That way if you get the answer wrong due to the calculation but I can see that you did know what to do you’ll get most of the marks for the question. Calculators will be permitted in TQM.
I have updated the post on the video (coffee machines) explaining what Cp and Cpk are to include a video of me explaining what Standard Deviation and Mean are. You can download it from this post here: http://lecturehub.ie/?p=115
Cp is Process Capability Ratio, it tells us if a process is capable (at least 1 or greater). For six sigma the Cp value must be 2 or greater. It estimates what the process is capable of producing if the process mean were to be centered between the specification limits. It assumes process output is approximately normally distributed. Cpk is Process Capability Index, it estimates what the process is capable of producing, considering that the process mean may not be centered between the specification limits. Below is a video explaining the two. You can download another video explaining what Cp/Cpk, Standard deviation and Mean are here: https://www.youtube.com/watch?v=TZRWWZuww4M