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In most countries, primary and secondary education is the responsibility of the
Cronbach's Alpha
A coefficient of reliability or internal consistency of a psychometric instrument, indicating how well the items in the test measure the same concept or construct.
Internal Consistency Reliability
A measure of how well the items on a test measure the same concept or construct, often assessed by Cronbach's alpha.
Parallel Forms Reliability
The consistency of the results of two tests constructed in the same way from the same content domain.
Internal Validity
The extent to which a study establishes a trustworthy cause-and-effect relationship between a treatment and an outcome.
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