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The sign test is a non-parametric statistical test used in psychology and other social sciences to evaluate the difference between paired observations without making assumptions about the distribution of data. It is particularly useful when data are ordinal or when the assumptions of parametric tests like the paired t-test are not met. The test focuses on the direction of differences rather ________ ________ _____ ________ ________ _______ __________ ________ ______.
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