There is less variability in a set of nullified scores because the effects of individual differences in background have been removed.

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Nullifying scores means removing the effects of individual differences in background variables, such as age, gender, or socio-economic status. As a result, the variability in the scores is reduced, as individual differences are no longer contributing to it. Therefore, there is less variability in a set of nullified scores.

There Is Less Variability in a Set of Nullified Scores