Estimates variance based on a sample. In addition to numbers, text and logical values such as TRUE and FALSE are included in the calculation.
Syntax
VARA(value1,value2,...)
Value1,value2,... are 1 to 30 value arguments corresponding to a sample of a population.
Remarks
- VARA assumes that its arguments are a sample of the population. If your data represents the entire population, you must compute the variance using VARPA.
- 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 VAR function instead.
- VARA 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 | =VARA([St1], [St2], [St3], [St4], [St5], [St6], [St7], [St8], [St9], [St10]) | Estimates the variance for the breaking strength (754.2666667) |