Reliability Testing Types

Test-Retest Reliability

The method of giving the same test to the same group of people at two different times to check score stability over time.

Practice Effect

The phenomenon where people improve their test scores on a second attempt due to familiarity with the questions.

Parallel-Forms Reliability

Creating two different versions of a test with different questions covering identical content, ensuring results are not dependent on a specific set of questions.

Internal Consistency

A measurement of how well the questions on a single test work together, indicating that they measure the same construct.

Split-Half Reliability

A method where a test is split into two halves to compare scores, ensuring consistency in results.

Kuder-Richardson Formula 20 (KR-20)

A statistical measure used to determine the reliability of assessments with right/wrong answers.

Cronbach's Alpha

A statistical measure used to assess the reliability of scale questions in a test, typically rated on a scale of 1 to 5.

Inter-Scorer Reliability

Testing to see if multiple people scoring the same test yield similar results, reflecting the test-taker's performance rather than scorer bias.