Statistical Sciences 2035 Study Guide - Quiz Guide: Type I And Type Ii Errors, Bonferroni Correction, Analysis Of Variance
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16 Oct 2018
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The difference between group 1 and group 2 at the first posttest (simple effect 1) The difference between group 1 and group 2 at the second posttest (simple effect 2: they can both be tested using 1-way bs anova, or (which for 2 groups is essentially the same) an independent samples t-test. Use alpha=0. 025, because then the overall probability of type 1 error is 5: that"s bonferroni correction. They are both nonsignificant: contradicts the finding of a significant interaction! Additional to the upper anova, you can also get a 1-way anova on the average timepoint (veg_ave) and/or on the difference timepoint (veg_diff): This is not explained in the tutor manual. But you can see that this effect is significant. Add another level of the bs group factor 3 bs factors, 2 ws factors. In the spss output, with only 2 bs levels, the bs effect was significant & interaction as well.