Romagnano (2001) further argues his point by drawing on both first- and second-hand data to show how inconsistent grading is on everything from a quiz all the way up to the SAT-I mathematics test. This inconsistency creates what is called in the sciences a measurement error. For example, the measurement error on the SAT-I mathematics test is 30 points. This means that if a student scores 470, we can say with 95% certainty that their score is somewhere between 410 and 530 points. This is a huge measurement error. And it is on the SAT-I, one of the most tightly controlled assessments in the
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