Regarding this second assumption, Agresti and Franklin (2014) 2 propose that both outcomes should occur at least 10 times in both samples. Z-tests for independent proportions require 2 assumptions: Now, before running the actual z-tests, we first need to make sure we meet their assumptions. We'll use exam-questions.sav -partly shown below- throughout this tutorial. So let's see how to run them and interpret their output. Score similarly on a dichotomous variable.Įxample: are the proportions (or percentages) of correct answers equal between male and female students?Īlthough z-tests are widely used in the social sciences, they were only introduced in SPSS version 27. SPSS Z-Test for Independent Proportions Tutorial report this ad By Ruben Geert van den Berg under Nonparametric TestsĪ z-test for independent proportions tests if 2 subpopulations
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