A test statistic contains information about the data that is relevant for deciding whether to reject the null hypothesis. Its observed value changes randomly from one random sample to a different sample. ![]() ![]() The test statistic is used to calculate the p-value.Ī test statistic measures the degree of agreement between a sample of data and the null hypothesis. The test statistic compares your data with what is expected under the null hypothesis. You can use test statistics to determine whether to reject the null hypothesis. ![]() A test statistic is a random variable that is calculated from sample data and used in a hypothesis test.
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