下面给出了小白鼠在接种三种不同菌型伤寒杆菌后的存活日数: 菌型 存活日数 A1 A2 A3 2 4 3 2 4 7 7 2 5 4 5 6 8 5 10 7 12 6 6 7 11 6 6 7 9 5 10 6 3 10 假定小白鼠的存活日数服从方差相等的正态分布.在显著性水平<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17016397/88a14c1-chaoxing2016-51562.jpeg' />下,要检验三种菌型下小白鼠的平均存活日数有无显著差异,则下列表示或结论不正确的是

A、要检验假设<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17016397/81f8561-chaoxing2016-1576.jpeg' />:三种菌型的平均存活日数无显著差异. B、用检验统计量<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17016397/f7f7bbc-chaoxing2016-51647.jpeg' />,拒绝<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17016397/81f8561-chaoxing2016-1576.jpeg' />的拒绝域:<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17016397/b666f57-chaoxing2016-51648.jpeg' />,其中<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17016397/cc4c11f-chaoxing2016-51649.jpeg' />分别为组内差(随机误差)平方和与组间差平方和. C、<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17016397/5d146b9-chaoxing2016-51650.jpeg' /> D、结论: 三种菌型下小白鼠的平均存活日数有显著差异.

时间:2024-03-20 12:40:12

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