The standard deviation formula for a sample is almost the same as the formula for a population, except you subtract N by 1 in the denominator, so it's: σ = √(Σ(xi - μ)² / N-1).

With standard deviation at 1.91 percent, it suggests that the range is plus or minus 1.91 percentage points from the average, meaning that Apple’s returns tend to range from -1.83 percent to 1. ...

The formula for pooled standard deviation. In the formula above, n is the sample size of the group, S squared the group ...

Use Excel to calculate daily returns and standard deviation to gauge stock volatility. Annualize volatility by multiplying daily standard deviation by the square root of 252. Remember, standard ...

First, let's look at what a standard deviation is measuring. Consider two small businesses with four employees each. In one business, two employees make $19 an hour and the other two make $21.

Gunsmiths use the Standard deviation formula as well. Standard deviation computation is easily done with modern devices. The old fashioned way will get you through when the power goes out.

Standard deviation measures how far numbers in a data set are spread out from an average value. In investing, it is used as a measurement of portfolio volatility.

For the bottom portion or denominator of the residual standard deviation equation, n = the number of data points, which is 4 in this case. Calculate the denominator of the equation as: (Number of ...