A z-test is a statistical test used to determine whether two population means are different when the variances are known and the sample size is large.

The large sample variance of the Mantel-Haenszel estimator of the odds ratio calculated from a set of k 2 x 2 tables is derived. The asymptotic results are derived under the assumption that the number ...

Elizabeth Tipton, James E. Pustejovsky, Small-Sample Adjustments for Tests of Moderators and Model Fit Using Robust Variance Estimation in Meta-Regression, Journal of Educational and Behavioral ...