Test of Hypothesis(假设检验) Case Study - in the Context of Software Industry
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Case: 组织采用了新的编码方法,并推广到项目中,想了解编码效率是否有所改善?下表是改善前后的编码效率值(Effort/Size)
Pre
Post
4.40
4.40
3.60
6.00
4.50
7.50
2.60
5.20
5.50
5.50
8.40
10.50
6.00
4.80
6.00
6.00
2.60
3.90
5.50
5.50
3.90
6.50
2.20
4.40
4.20
8.40
2.40
6.00
7.50
7.50
2.40
6.00
7.50
7.50
3.90
6.50
5.50
5.50
5.20
5.20
Step1. 评估编码过程是否有所改善?
Step2.
零假设:新方法实施后,编码效率并没有提高。
备择假设:新方法实施后,编码效率的均值有所提高。
新方法实施后,编码效率的离散程度有所减少。
。。。待续
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