Reliability and Validity in Testing

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What is the reliability coefficient?

Back

The ratio of the variance of true scores to the variance of observed scores, reflecting how much of the score is due to actual differences versus measurement error.

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What does higher reliability indicate?

Back

More consistent and dependable measurement.

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What is Test-Retest Reliability?

Back

A method that measures consistency over time, suitable for stable traits.

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What are the issues with Test-Retest Reliability?

Back

Carryover effect (first test affects second) and practice effect (skills improve with repetition).

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What is Parallel Forms Reliability?

Back

It compares two equivalent versions of a test measuring the same attribute.

Front

What does Internal Consistency Reliability examine?

Back

It examines consistency within the same test across similar items.

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What is the Split-Half Method?

Back

A method that divides a test into two parts (e.g., odd-even) and compares the results.

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What is Coefficient Alpha (Cronbach's α)?

Back

A general estimate of internal consistency, best for items not scored as 0/1.

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What is the Kuder-Richardson Formula 20 (KR-20)?

Back

A formula used for dichotomous items (right/wrong).

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What does the Kappa Statistic measure?

Back

Inter-rater agreement for categorical items.