) in the estimator. The connection among the 3 quantities is given with the formula RMSE=Bias2+SD2 (the formula will not be correct for ends in the table as a consequence of rounding). where pi is the proportion of right responses to test item i, qi is definitely the proportion of https://jeffreyqpjml.blogocial.com/5-simple-statements-about-kr20-formula-explained-62717683