Educational Psychology / Unit 13 EDP 1230 review, 2 to 3 minutes
Reading a Score Report
The idea
Every test score a teacher reads raises four questions the course has answered one at a time. First, how consistent is it? Reliability, estimated in several ways, is necessary for any use, and the standard error of measurement means every score is a band, not a point. Second, what does it compare the student with? A criterion-referenced reading compares with a standard; a norm-referenced reading compares with a norm group; standard scores and percentiles place the score on the normal curve; grade equivalents are estimates that are often misread. Third, what use is it valid for? Validity belongs to interpretations and uses: content evidence for judging what was learned, construct evidence for judging an ability, predictive evidence for selection. Fourth, what else could explain it? Construct-irrelevant factors such as language or anxiety, bias in content, and contested effects such as stereotype threat all bear on what a score can mean.
In practice
Worked example: a parent brings a report showing her son at the 45th percentile on a state mathematics test, a scaled score slightly below the proficiency cut, and an A in class mathematics. The teacher explains that the percentile compares him with a norm group, that the scaled score sits within its standard error of the cut, so the difference is small, and that grades and standardized scores can disagree, each telling something the other misses. The teacher then checks the criterion-referenced results to see which skills to practice next.
Where people slip
A single score answers none of these questions alone. Treat each score as consistent only within its error, meaningful only against its reference group or standard, valid only for particular uses, and open to explanations other than ability. High stakes magnify every weakness, which is why a single score is never the whole picture of a student.
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