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p-value
A p-value is the measure of probability that the null hypothesis was rejected when in fact the null hypothesis is true. The p-value corresponds to the area underneath the standard normal distribution curve at or more extreme of a calculated test statistic. The lower the p-value, the smaller the smaller the chance we mistakenly rejected the null when the null was true. The p-value can be calculated via an online calculator with the test statistic (z-test or t-test).
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