A statistical test that allows one to determine whether observed quantities of a specific characteristic differed from the expected value purely by chance.

A modified form of the Pearson χ 2 test statistic is considered where estimators based on the ungrouped sample are employed in the test statistic as well as in determining the class interval end ...

Wald's method constructs test statistics having chi-squared limiting distributions from estimators having nonsingular multivariate normal limiting distributions, using the inverse of the covariance ...