What is split-half reliability?

Split-half reliability is indeed a reliability testing method that involves dividing a test into two segments. This approach assesses the consistency of a test by comparing the results of the two halves. The underlying principle is that if a test is reliable, both halves should yield similar results when administered to the same group of participants. The extent to which scores from the two segments correlate provides a measure of the test's reliability.

This method is particularly useful because it effectively reduces the impact of random error, as each half tends to reflect the same level of ability among test-takers. By analyzing the correlation between the two sets of scores, educators and researchers can evaluate the test's reliability without needing to conduct a retest or involve a different group of test participants. This assessment helps ensure that the instrument consistently measures the construct it is intended to measure over time.

Other options do not accurately describe split-half reliability. For instance, while assessing prediction accuracy is important in testing, it is not the focus of split-half reliability. Additionally, comparisons of results from different instruments involve a different assessment of reliability and validity, not the internal consistency that split-half reliability measures. Finally, measuring how well participants remember test questions pertains to recall and retention, which is unrelated to the method of dividing a test