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Population variance, sample standard deviation, z-scores and combinations.

Results update as you type. Use Reset current mode to restore the example. Copy mode link shares the selected formula, not your entered values. Display precision changes presentation only.

Calculation methods and assumptions

Population variance divides by N, while sample standard deviation uses Nāˆ’1. Z-scores require a positive standard deviation. Combinations count unordered selections. Inputs are numbers with no missing values.

Try an example

For values 2, 4, 4, 4, 5, 5, 7, 9, population variance is 4. For n = 5 and r = 2, combinations = 10.

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