Question: To achieve maximal variability across the sample in a norm-referenced test, what level of difficulty should a test maker strive for? To achieve maximal variability

To achieve maximal variability across the sample in a norm-referenced test, what level of difficulty should a test maker strive for? To achieve maximal variability across the sample in a norm-referenced test, what level of difficulty should a test maker strive for? 100% 50% 30% 10%

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