Several statistical tests have a way to measure effect size

Several statistical tests have a way to measure effect size. What is this, and when might you want to use it in looking at results from these tests on job related data?

Solution

Effect size, in Statistics, is a quantitative test of a measure of a phenomenon.

Some ways to measure this are

i) Correlation coefficient

ii) Regression line

iii) Mean difference, etc.

In fact, effect size serves as a complement for hypothesis testing and hence plays an important role, in statistical power analysis, sample size and meta analysis.