分析了参数的显著性检验中由于零假设的不同选择所出现的问题，探讨了零假设的选择原则。
This paper analyzes the problem appearing in the parameter significance testing based on different choice of null hypothesis and discusses the choice principles of null hypothesis.
用参数来检验广告促销效果的显著性，由于假设性限制难以满足，致使有效性下降。
The limits of parameter test of AD effect on expanding commodity sales usually lead to lowering of efficiency.
本文论述了假设检验中两类错误之间的关系，并给出了在实际应用中选取原假设与显著性水平的一些方法。
This paper discuss the relationship between two types of errors in statistical hypothesis, and points out choosing the primary hypothesis and the significant level in the actual application.
本文论述了假设检验中两类错误之间的关系，并给出了在实际应用中选取原假设与显著性水平的一些方法。
This paper discuss the relationship between two types of errors in statistical hypothesis, and points out choosing the primary hypothesis and the significant level in the actual application.
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