Which criteria should be used to select higher performing schools? The assessment of statistical significance helps researchers summarize the evidence against a null hypothesis. However, it is not always a simple task to discern the true meaning or value of the results of null hypothesis...
- [image: NCEA & ACT logo JPEG.jpg]( The standard error of the school effect size is highly dependent on the number of grade-levels. ) ( Standard Error ) ( Number of Students in the Analysis )[image: ] [bookmark: IDX] ( More students or grade-levels and higher significance levels lead to higher power to detect a true effect size. ) ( Power ) ( Number of Students in the Analysis )[image: ][image: Page_Title_Bar.png] ( Number of Students in the Analysis )Since smaller schools are more variable, is this biased towards smaller schools?