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California's school accountability system was originally based solely on scores from the CAT/6. Through the Academic Performance Index (API), the scores drove the allocation of millions of dollars in intervention and award programs, depending on the health of the state’s budget. (The state has not funded award or intervention programs based ...
A confidence interval approach is also used, where after each item is administered, the algorithm determines the probability that the examinee's true-score is above or below the passing score. [ 16 ] [ 17 ] For example, the algorithm may continue until the 95% confidence interval for the true score no longer contains the passing score.
However, as these normal students took the test in 1979, percentile rankings may be different when compared to a more recent group of test-takers. [3] The minimum scores required for qualification for the 2nd to 10th grade CTY summer courses are below: [4] [5] Grade 2 ≥ 430 SCAT Verbal or 435 SCAT Quantitative
The figure illustrates the percentile rank computation and shows how the 0.5 × F term in the formula ensures that the percentile rank reflects a percentage of scores less than the specified score. For example, for the 10 scores shown in the figure, 60% of them are below a score of 4 (five less than 4 and half of the two equal to 4) and 95% are ...
The NNAT has been found by one study to show excessive score variability, with within-grade standard deviations reaching as high as 20 points. This has the effect of both overrepresenting and underrepresenting index scores - that is, more students received very high or very low scores than expected.
The prediction interval for any standard score z corresponds numerically to (1 − (1 − Φ μ,σ 2 (z)) · 2). For example, Φ (2) ≈ 0.9772 , or Pr( X ≤ μ + 2 σ ) ≈ 0.9772 , corresponding to a prediction interval of (1 − (1 − 0.97725)·2) = 0.9545 = 95.45% .
The test purports to assess students' acquired reasoning abilities while also predicting achievement scores when administered with the co-normed Iowa Tests. The test was originally published in 1954 as the Lorge-Thorndike Intelligence Test , after the psychologists who authored the first version of it, Irving Lorge and Robert L. Thorndike . [ 1 ]
In statistics, a k-th percentile, also known as percentile score or centile, is a score below which a given percentage k of scores in its frequency distribution falls ("exclusive" definition) or a score at or below which a given percentage falls ("inclusive" definition); i.e. a score in the k-th percentile would be above approximately k% of all scores in its set.