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Confidence Interval

Statistical procedures will be used in all tests of School Progress determinations to ensure that decisions take into account inherent measurement error present in all accountability systems. The confidence interval is a statistical tool used in Maryland School Progress determinations to ensure accurate and reliable accountability decisions. Because the accuracy of scores depends on the number of students in each group, the state uses a statistical test to help ensure that they make fair and valid School Progress decisions for groups with different numbers of students.