This example shows some of the statistical functions that use the sample method of computation. These include:

• STDEVSAMP - computes standard deviation using the sample method. See STDEVSAMP Function.
• VARSAMP - computes variance using the sample method. See VARSAMP Function.
• STDEVSAMPIF - computes standard deviation based on a condition and using the sample method. See STDEVSAMPIF Function.
• VARSAMPIF - computes standard deviation based on a condition and using the sample method. See VARSAMPIF Function. 

Source:

Students took tests on three consecutive Saturdays:

Transformation:

You can use the following transformations to calculate standard deviation and variance across all dates using the sample method. Each computation has been rounded to three digits.

You can use the following to limit the previous statistical computations to the last two Saturdays of testing: 

Results: