Estimating the reliability of a test using Kuder-Richardson Formula 21 (KR-21) assumes that:

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Education · Educational Statistics

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Test items have similar (equal) difficulty levels

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Answer 1

Test items have similar (equal) difficulty levels

Answer 2

Test items have widely varying difficulty levels

Answer 3

A short time interval is given between administration of two equivalent forms

Answer 4

A long time interval is given between administration of the same test

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