Six sigma basic statistical introduction
Standard deviation
- Standard deviation (s) formula as shown below:
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- First, get the different between the measured value and the mean , and square them.
- For example: (12-15.9)2 = 15.21
- List out all the calculated result as per table below
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- Finally, divide (number of the sample minus 1) and square root it.
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- Use Microsoft Excel function: =STDEV( numbers).
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