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Suppose you have n observations {x1, x2, ... , xn} for a variable, X.
Calculate m = (x1 + x2 + , ... , + xn)/n, the mean value.
Calculate s2 = (x12 + x22 + , ... , + xn2)/n
Then Variance = s2 - m2 = [mean of the squares] - [square of the mean]
and the standard deviation = sqrt(Variance)
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How do you calculate variance given standard deviation?
Square the standard deviation and you will have the variance.
What is the standard deviation of 9?
You need more than one number to calculate a standard deviation, so 9 does not have a standard deviation.
How do you calculate standard deviation if I know variance?
Standard deviation = square root of variance.
What is the definition of standard deviation?
Standard deviation is how much a group deviates from the whole. In order to calculate standard deviation, you must know the mean.
How do you calculate mean and Median smaller then Standard deviation?
In the same way that you calculate mean and median that are greater than the standard deviation!
