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# standard deviation raised to the power 2 silly question

Posted on 2011-03-01
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STD = SQRT( (Xi - Mean(X))^2/(n-1)

i want to raise it to the power 2. lol i forgot how to do it. i know it's silly but it just can't come to my mind
will it be become (Xi - Mean(X)**4/(n-1)**2????
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Expert Comment

ID: 35006718
There is a mismatch in the brackets in your formula. But anyway: If you raise a square root to power 2 this gives that which is in / under the square root, so
sqrt ((Xi - Mean(X))^2/(n-2)) raised to power 2 is (Xi-Mean(X))^2/(n-2).
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abbright earned 2000 total points
ID: 35006736
Sorry, it is  (Xi-Mean(X))^2/(n-1) of course.
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Author Closing Comment

ID: 35006764
oh ok thank u abb. I was a little confused.
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