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Uploaded on Oct 7, 2010
Use a histogram to determine the distribution of measurable data and the capability (i.e., the level of performance the customers can consistently expect) of the process. Process capability is determined using your data and the customer's upper specification (USL) and lower specification limits (LSL).
Its difficult to create a histogram in Excel, but it's easy using QI Macros SPC Software. Just select your data and then select histogram from the QI Macros pull down menu. The QI Macros will draw the histogram and calculate all of the process capability metrics for you.