o achieve maximal variability across the sample in a norm referenced test (Classical Test Theory framework), what level of difficulty across items should a test maker strive for 100 50 30 10

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o achieve maximal variability across the sample in a norm referenced test (Classical Test Theory framework), what level of difficulty across items should a test maker strive for  100  50  30  10

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Question: o achieve maximal variability across the sample in a norm-referenced test (Classical Test Theory framework), what level of difficulty across items should a test maker

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