How To Calculate A P Value?

State the null hypothesis and alternative hypothesis

Choose the appropriate statistical test

Determine the test statistic from your sample data

Identify the sampling distribution under the null hypothesis

Calculate the p value as the probability of observing a result at least as extreme as the test statistic

For a one-tailed test, use the probability in one direction

For a two-tailed test, double the one-tailed tail probability

Compare the p value to the chosen significance level

Reject the null hypothesis if the p value is less than or equal to the significance level

Fail to reject the null hypothesis if the p value is greater than the significance level

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