One is to ask, for a given reliability coefficient, how large is the band of error around an individual score? For example, even though the SAT is a highly reliable test, with a reliability coefficient over .90, the standard error of measurement is more than 30 points, similar to that shown in Figure 7.2. A reliability coefficient of .80 indicates an error band roughly 40 percent larger, and a reliability coefficient of .70 indicates an SEM almost 75 percent larger
