The equation for the standard error of the mean is the sample standard deviation divided by the square root of the sample size.

Understanding standard deviation means first understanding variance because standard deviation, mathematically speaking, is the square root of variance.

Learn how to calculate Standard Deviationin Excel. The STDEV function can be used to estimate standard deviation based on sample in Excel.

Standard deviations are important here because the shape of a normal curve is determined by its mean and standard deviation. The mean tells you where the middle, highest part of the curve should go.

Many standard test and estimation procedures require the computation of the sample standard deviation. It is, however, often possible to replace the standard deviation by the more easily computed ...

Rate of Return & Standard Deviation. Rate of return and standard deviation are two of the most useful statistical concepts in business. These two figures will tell you whether a business project ...