02 Apr Based on the current discussion on assessing reliability,

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Week 4 Discussion: Assessing Reliability

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Week 4 Discussion: Assessing Reliability

Test-retest reliability is a method that measures the stability of scores for a given test sample over time. According to Chapter 7 of Kline’s (2005) book, the process checks whether a test produces stable and consistent results over time. The method involves administering the same test to the same group for attest two times at different points in time, T1 and T2. If the two tests produce the same score at both times, it indicates a high correlation and, therefore reliable. One of the key considerations in this method is that the time interval should not be too long as it might result in changes in measure traits, or too short to avoid bias.

The alternative forms reliability method assesses the consistency of a test by comparing the scores of two equivalent but different versions of a similar test, which measure the same construct. The goal of this method is to determine if two forms produce the same or similar results. According to Kline (2005), the two tests should be similar in terms of content, structure, and difficulty but not identical. The method involves creating two equivalent but different forms of a test, administering them to the same group, and then correlating the result. During comparison, a high correlation indicates that the form is reliable.