STDEV
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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).
Syntax
STDEV ( number1 ,number2,...)
Number1,number2,... are 1 to 30 number arguments corresponding to a sample of a population.
Remarks
Logical values such as TRUE and FALSE and text are ignored. If logical values and text must not be ignored, use the STDEVA function.
STDEV assumes that its arguments are a sample of the population. If your data represents the entire population, then compute the standard deviation using STDEVP.
The standard deviation is calculated using the "nonbiased" or "n-1" method.
STDEV 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 |
=STDEV([St1], [St2], [St3], [St4], [St5], [St6], [St7], [St8], [St9], [St10]) |
Standard deviation of breaking strength (27.46391572) |