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Even short tests can still be materially shortened when they are intended to provide rough information. An example of a short intelligence test shows that considerable reductions are permissible when the procedure is intended to classify subjects into IQ groups of roughly "under 100" or "over 100". Also division into three as below average, average and above average level of intelligence is possible, and also division into four grades. If about 85% accuracy is satisfactory, a three-problem test is sufficient. For grading into three and four parts, six and nine problems, respectively may be adequate.
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