Estimates variance based on a sample.
Syntax
VAR(number1,number2,...)
Number1, number2, ... are 1 to 30 number arguments corresponding to a sample of a population.
Remarks
- VAR assumes that its arguments are a sample of the population. If your data represents the entire population, then compute the variance using VARP.
- Logical values such as TRUE, FALSE, and text are ignored. If logical values and text must not be ignored, use the VARA worksheet function.
- VAR uses the following formula:
where x is the sample mean AVERAGE(number1,number2,…) 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?- Create a blank workbook or worksheet.
- Select the example in the Help topic. Do not select the row or column headers.
Selecting an example from Help
- Press CTRL+C.
- In the worksheet, select cell A1, and press CTRL+V.
- To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.
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