the correlation between variables or difference between groups) divided by the variance in the data (i.e. Generally, the test statistic is calculated as the pattern in your data (i.e. The test statistic summarizes your observed data into a single number using the central tendency, variation, sample size, and number of predictor variables in your statistical model. Different statistical tests predict different types of distributions, so it’s important to choose the right statistical test for your hypothesis. The distribution of data is how often each observation occurs, and can be described by its central tendency and variation around that central tendency. Frequently asked questions about test statisticsĪ test statistic describes how closely the distribution of your data matches the distribution predicted under the null hypothesis of the statistical test you are using.
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