Prof. R.A. Fisher used the word variance first time in 1920 for the statistical analysis of data . This variance is used for calculating variation . Prof. R.A. Fisher developed a new technique for analysis the variance and study the features of two and more variables variation . If we have to investigate chi - square variates , then we should use F -Test . In other words , it is sample test for analysis chi square variation .
Its formula is given below :-