$P-Value$

P-Value

P-value from a z, t or chi-square statistic for one- and two-tailed tests, with a conclusion at the significance level.

What to find:

Z-test

Student's t-test

Chi-square test

Test yourself

A p-value is the probability of a result at least this extreme if the null hypothesis is true.

How to read it

If p is below the significance level α, usually 0.05, the null hypothesis is rejected. A large p-value does not prove the hypothesis: it only means the data do not contradict it.

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