What is split-half reliability?

Split-half reliability is indeed a technique to assess the internal consistency of a test by dividing it into two halves. This method involves creating two sets of scores from the same test, typically by separating the questions into two equal groups. The scores from each half are then compared to determine how similarly the two halves perform in measuring the same construct. A high correlation between the halves indicates strong internal consistency, implying that the test reliably assesses what it is intended to measure.

In contrast, the other choices do not accurately describe split-half reliability. The first option addresses validity, which is a different concept focused on whether a test measures what it claims to measure. The third option references a formula for calculating test scores, which doesn't pertain to the reliability aspect discussed. Lastly, stating that the method is used exclusively for dichotomous tests limits its application; split-half reliability can be utilized for a variety of test types, not just those with two response options.