Background: Comparison of parameters between two or more groups forms the basis of hypothesis testing. Statistical tests (and statistical significance) are designed to report the likelihood the observed results are caused by chance alone, given that the null hypothesis is true.

中文翻译：

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医学统计学基础介绍，第 2 部分：比较数据

背景：两组或多组参数的比较构成了假设检验的基础。统计检验（和统计显着性）旨在报告观察到的结果仅由偶然性引起的可能性，假设原假设为真。