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probability value
probability value A probability value, or p value, is the chance of getting a result at least as different from what the null hypothesis specifies as the result actually observed, assuming the null hypothesis is true.
A probability value, or p value, is the chance of getting a result at least as different from what the null hypothesis specifies as the result actually observed, assuming the null hypothesis is true. Smaller p values indicate stronger evidence against the null hypothesis, and they may be calculated for one-tailed or two-tailed tests.