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Eval11 Poster 55: Visualizing Significance

In addition, the relationship between statistical significance and confidence intervals, and the trade-offs inherent in choosing a significance level, power, and sample size in the context of variability and the determined level of practical significance will be illustrated

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Focus Search - [bookmark: IDX] ( Top 10% of school effect sizes ) ( Effect Size ) ( Number of Students in the Analysis )[image: ] [bookmark: IDX1] ( School effect size differs statistically significantly from zero at 0.01 level ) ( Effect Size ) ( Number of Students in the Analysis )[image: ] [bookmark: IDX2] ( School e ffect size exceeds 0.2 ) ( Effect Size ) ( Number of Students in the Analysis )[image: ] [bookmark: IDX3] ( Lower end of confidence interval exceeds school effect size of 0.2 ) ( Effect Size ) ( Number of Students in the Analysis )[image: ]Visu lizing Signific nce Lynn Mellor Principal Research Manager NCEA/ACT, Austin, TX lmellor@nc4ea.org Steve Fleming Senior Systems Analyst NCEA/ACT, Austin, TX sfleming@nc4ea.org 1 What?