# STDEVA function

Estimates standard deviation based on a sample. The standard deviation is a measure of how widely values are dispersed from the average value (the mean). Text and logical values such as TRUE and FALSE are included in the calculation.

## Syntax

STDEVA(value1,value2,...)

Value1,value2,...     are 1 to 30 values corresponding to a sample of a population.

## Remarks

• STDEVA assumes that its arguments are a sample of the population. If your data represents the entire population, you must compute the standard deviation using STDEVPA.

• Arguments that contain TRUE evaluate as 1; arguments that contain text or FALSE evaluate as 0 (zero). If the calculation must not include text or logical values, use the STDEV spreadsheet function instead.

• The standard deviation is calculated using the "nonbiased" or "n-1" method.

• STDEVA uses the following formula:

## Example

Suppose 10 tools stamped from the same machine during a production run are collected as a random sample and measured for breaking strength.

 St1 St2 St3 St4 St5 St6 St7 St8 St9 St10 Formula Description (Result) 1345 1301 1368 1322 1310 1370 1318 1350 1303 1299 =STDEVA([St1], [St2], [St3], [St4], [St5], [St6], [St7], [St8], [St9], [St10]) Standard deviation of breaking strength for all the tools (27.46391572)
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