Effect Size Calculator for One Sample Z-Test

For a one sample z-test, Cohen’s d is a measure of the effect size of the test. It is calculated by using the following formula:

Cohen’s d : (x – µ) / σ

where x is the sample mean, µ is the population mean, and σ is the population standard deviation.

To find Cohen’s d for a given sample mean, population mean, and population standard deviation, simply enter the appropriate values in the boxes below and then click the “Calculate” button.

Sample mean (x)
Population mean (µ)
Population standard deviation (σ)

Rules of thumb for interpreting Cohen’s d :

d = 0.2 : small effect

d = 0.5 : medium effect

d = 0.8 : large effect

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