今有两台机床加工同一零件,分别取http://img0.ph.126.net/WUEfXMfsJOAunqzH3MhuZg==/3670152221430749034.png个及http://img2.ph.126.net/h21PvZy5XKTFRUVcRh0rfQ==/6608560762678293965.png个零件测其口径,数据分别记为http://img0.ph.126.net/9DsmMOeuUyWESd3-cpuVpg==/6598257239274460710.png; http://img0.ph.126.net/dQfYK41j0mwOPB8wQwllGw==/6631436102099290248.png.计算得: http://img2.ph.126.net/IuZQ9mmyOMbv13aa3DQgnw==/6631431704052892643.png假定零件口径服从正态分布.在显著性水平http://img2.ph.126.net/9bPxPHDnnH_t0JjhkNyxEw==/6619070994328038857.png下,若用http://img1.ph.126.net/zCNV5FTYIQfJZdNFfuP_bQ==/6598135193483774488.png检验法检验这两台机床加工的零件口径的方差是否有显著性差异,则检验统计量的值和检验结果分别是
举一反三
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- <img src="http://img0.ph.126.net/q6tqn77YyTg_j7CabeHYJw==/3109735542717391842.jpg" />? <img src="http://img1.ph.126.net/QO3FWMGgxAVtN31l0ulKFw==/6619487709235793443.jpg" />|<img src="http://img2.ph.126.net/-x9WCwFJKaqmfOJLJjH0_Q==/6630623563001319953.jpg" />|<img src="http://img1.ph.126.net/5eiGUQZYA2gEX9q4m57n4Q==/6608642126539334311.jpg" />|<img src="http://img1.ph.126.net/YixVkAU6iexb7xitW-q8Lg==/6630125484233816848.jpg" />
- n位触发器构成的扭环形计数器，其无效状态数有( )个。? <img src="http://img1.ph.126.net/syawN86lkJeyXf8emf2enw==/6630087001327300267.png" />|<img src="http://img2.ph.126.net/0JBcfdqdyUjt5-uTh7cmUQ==/4886405595797893661.png" />|<img src="http://img2.ph.126.net/qBQGx0Z9T_pt4PZJc8Nn7g==/6608560762678510607.png" />|<img src="http://img0.ph.126.net/elyGxaiPbD815O67sULOnQ==/1876312194853825038.png" />
- 设总体X～N(μ,σ^2),μ和σ是未知参数。为估计参数σ^2的置信区间，应选T=____________作为枢轴变量,并且T服从______。? <img src="http://img2.ph.126.net/SHUrsWncVzw3TbqMT630Ug==/6632510324955921443.png" /><br />|<img src="http://img2.ph.126.net/I5VmIURcDfhDZIPIQy5JZw==/6632334403095483329.png" />|<img src="http://img0.ph.126.net/v1kDLV9rE4i9IWRPugufXQ==/6632404771839652521.png" />|<img src="http://img0.ph.126.net/sQOy3VhGtuk-bcM7dsC3kQ==/6632272830444326010.png" />