How reliable is the GMAT? Do scores vary a lot from test to retest?
AnswerThe standard error of measurement of the GMAT Total score is 29 points—meaning that the test taker’s true GMAT Total score is within 29 points (above or below) of the score he or she received on the test. Thus, test takers with GMAT Total scores of 580 and 600 may not be materially different in terms of their performance on the GMAT. This is why GMAC does not recommend the use of hard cut-off scores. The average reliability for the GMAT Total score is 0.92 (1.00 is the highest possible reliability coefficient). • How valid is the GMAT? Does it actually predict the academic achievement of MBA students? AnswerThe predictive validity of the GMAT has been established by analyzing the statistical relationship between GMAT scores and first-year (or midprogram) grade point average. Analyses of the relationship between a combination of three of the GMAT variables—Verbal, Quantitative, and AWA—and first-year (or midprogram) grade point average have been conducted at numerous schools since
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