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Example of Finding a pp-Value for a tt Score

To illustrate finding a pp-value, consider a sample of 25 individuals (which provides 24 degrees of freedom) resulting in a computed tt score of 1.50. The probability of obtaining a tt score at least this extreme depends on the proportion of expected scores in the corresponding distribution that are far from zero. Defining extreme in both directions, the pp-value is the proportion of expected tt scores that are 1.50 or greater, combined with those that are -1.50 or lower. In this scenario, that combined proportion is .14, meaning the final pp-value is .14.

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Updated 2026-06-28

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Research Methods in Psychology - 4th American Edition @ KPU

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