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The Present Status
The Measurement of Difficulty
Table 3The Variability of Four Individuals in Intellect Accord
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40-composite ability measured absolute zero adults altitude of intellect amount approximately arithmetical problems Army Alpha average central tendency composite tasks computed consensus Corrected for Attenuation correlation Credit if successful culty curve determinations differences in difficulty diffi equal difficulty error estimate facts form of distribution Freshmen Grade 12 Grade 9 grade populations Group 13 harder individuals intel Intellect CAVD intellectual difficulty intellectual tasks Intelligence Examination intercorrelations Interval lect level of difficulty mean square error measure of altitude measurement of intellect measuring intellect mental age metical number of tasks obtained original scale Otis Advanced percents correct Permille probably pupils in Grade range relation represent sampling sampling error scale with equal self-correlation sentence shown in Table single tasks Stanford Binet sub-series succeed summation score tellect Thorndike tion total series trials truly equal units values variability Vocabulary width words zero