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SPSS means “Statistical Package for the Social Sciences” and was first launched in 1968. Since SPSS was acquired by IBM in 2009, it's officially known as IBM SPSS Statistics but most users still just refer to it as “SPSS”.SPSS - Quick Overview Main Features...
Learning statistics with JASP: A tutorial for psychology students and other beginners; 2019. https://learnstatswithjasp.com/. Etz A, Vandekerckhove J. A Bayesian perspective on the reproducibility project: Psychology. PLoS ONE. 2016; 11(2):0149794. https://doi.org/10.1371/journal.pone....
The figure below shows how SPSS presents the output for this example. Effect Size - (Partial) Eta SquaredSo far, our conclusion is that the population means are not all exactly equal. Now, “not equal” doesn't say much. What I'd like to know is exactly how different are the means?