Histogram

Minitab

Use Stat\Quality Tools\Capability Analysis.

Excel

Using Green Belt XL Add-On

Use New Chart\Histogram. (Note: The histogram also may be displayed as an option with the Image and individual-X control charts.)

Interpretation

An advantage of a histogram is that the process location is clearly identifiable. In Figure F.17, the central tendency of the data is about 75.005. The variation is also clearly distinguishable: We expect most of the data to fall between 75.003 and 75.007. We also can see if the data are bounded or if they have symmetry, such as is evidenced in these data.

If your data are from a symmetric distribution, such as ...

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