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Standard Deviation - Manual vs. Excel Formula
Hi all,
Having some issues with understanding how Excel is calculating the data for SD. Tried it using both manually and using the =STDEV.S function.
Left hand side: S.D is 0.12 (=STDEV.S)
Right hand side: using this method:
- Step 1: Find the mean.
- Step 2: Subtract the mean from each score.
- Step 3: Square each deviation.
- Step 4: Add the squared deviations.
- Step 5: Divide the sum by one less than the number of data points.
- Step 6: Take the square root of the result from Step 5.
Now, as you can see in yellow, the values don't match. I verified that the =STDEV.S is using the "n-1" method, which matches my manual method.
Any idea what I'm missing here?
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