## Interpreting Differences Between Mean ACT Assessment Scores |

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### Common terms and phrases

0.1 scale score ACT Assessment mean ACT Assessment performance ACT Assessment scores ACT Composite score ACT English added to students Adding One Raw adding three raw adjusted mean Administered Composite scale score Composite score means confidence interval plot curriculum difference between means effect size effect sizes English item English raw scores English test example Form Subject-area test Increase In Mean increase over forms Interpreting Differences items answered correctly items correctly answered mean ACT Assessment mean ACT Composite mean ACT scores mean Composite scores median 8C method for interpreting number of items range statistic raw score units sample mean scale score means scale score unit Science Reasoning tests Score From Adding score unit difference score units added Score Units Form simultaneous confidence intervals standard deviation statistical significance student in Group substantiveness three raw score two-sample t test unadjusted mean ACT unit was added XYZ School District XYZ's research analyst