How To Calculate P Value In Statistics?

State the null hypothesis and alternative hypothesis

Choose the appropriate statistical test

Determine the test statistic from the sample data

Determine 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 probability in the relevant tail

Compare the p-value with the significance level alpha

Reject the null hypothesis if p-value is less than or equal to alpha

Fail to reject the null hypothesis if p-value is greater than alpha

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