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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.

https://preview.redd.it/a5y2rc12c1vg1.png?width=1388&format=png&auto=webp&s=2dda4cc8f87617ed6b33108ee30f690b7f561004

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?

submitted by /u/Byrne-88
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