![]() ![]() Then the results of one half can be correlated with the results of the other half of the test to determine the test’s reliability. ![]() In split-half reliability, a given test is divided into halves, which can be scored separately. Moreover, Cohen (2010) shows that the Spearman-Brown formula works best with lengthier tests as opposed to halved or shortened tests. Homogenous test items possess the same level of difficulty and length. This method is limited to the extent that it can only be used with homogeneous test items. According to Cohen (2010), the reliability of a test increases as the number of test items increases. This method is advantageous because it allows a test developer to estimate the reliability of a test by increasing or decreasing the number of test items. Here, the Spearman-Brown formula is used to measure internal consistency to this effect. This method is appropriate in determining the effect of lengthening or shortening the test on its overall reliability. ![]() Inter-item consistency measures the extent to which the items that purport to measure the same construct produce consistent results. Description, Goal, Application, and Appropriateness ![]()
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