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VARA

See Also

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 worksheet function instead.
• VARA uses the following formula:

  

  where x is the sample mean AVERAGE(value1,value2,…) and n is the sample size.

Example

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

The example may be easier to understand if you copy it to a blank worksheet.

How?