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