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ability accuracy achievement test algebra aptitude test arithmetic assess attribute central tendency characteristic comparable-form reliability computation construct validity content validity correlation coefﬁcient counselee counselor criterion measure criterion-related validity deﬁned difference scores difﬁcult error of measurement estimate evaluation evidence example expectancy table ﬁnd ﬁrst ﬁve frequency distribution Grade Point Averages group of examinees individual infer inﬂuence interpretation interval interval scale judgments low scores mean median normal curve number of scores ordinal scale ordinal statistic percent percentile performance person population potential predictive validity produce proﬁciency pupils quartiles rank raw score relate relationship reliability coefficient sample selection skewed distribution skills speciﬁc standard deviation standard error standardized test success teacher test author test designed test items test manual test norms test reliability test results test scores test user test validity test-retest tion types of errors typical validity coefficient validity studies variable Verbal Reasoning VR scores wants