# STDEVA

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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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