【判断题】【消耗次数:1】
相关系数越大,估计标准误差值就越大,从而直线回归方程的精确性越低
正确
错误
参考答案:
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相关题目
【判断题】 相关系数越大,说明相关程度越高;相关系数越小,说明相关程度越低。()
①  正确
②  错误
【判断题】 相关系数越大,说明相关程度越高;相关系数越小,说明相关程度越低。
①  正确
②  错误
【判断题】 相关系数数值越大,说明相关程度越高;相关系数数值越小,说明相关程度越低。()
①  正确
②  错误
【多选题】 直线回归方程( )。
①  建立前提条件是现象之间具有较密切的直线相关关系
②  关键在于确定方程中的参数a和b
③  表明两个相关变量间的数量变动关系
④  可用来根据自变量值推算因变量值,并可进行回归预测
⑤  回归系数b=0时,相关系数r=0
【多选题】 直线回归方程
①  建立前提条件是现象之间具有较密切的直线相关关系
②  关键在于确定方程中的参数a和b
③  表明两个相关变量间的数量变动关系
④  可用来根据自变量值推算因变量值,并可进行回归预测
⑤  、回归系数b=0时,相关系数r=0
【多选题】 相关系数与回归系数()。
①  回归系数大于零则相关系数大于零
②  回归系数小于零则相关系数小于零
③  回归系数大于零则相关系数小于零
④  回归系数小于零则相关系数大于零
⑤  回归系数等于零则相关系数等于零
【多选题】 相关系数与回归系数?
①  回归系数大于零则相关系数大于零
②  回归系数小于零则相关系数小于零
③  回归系数大于零则相关系数小于零
④  回归系数小于零则相关系数大于零
⑤  回归系数等于零相关系数等于零
【简答题】 估计标准差,离差值越小,反映观察点越靠近回归直线,即回归直线的代表性[填空1]。
【单选题】 项目的独立性分析,一般是采用项目间分数的相关系数来揭示,当相关系数越大时,说明独立性越?。
① 
② 
③ 
④ 
【判断题】 闪点越低的液体,火灾危险性就越大。
①  正确
②  错误
随机题目
【单选题】 This book has been in the works so long that I have lost _____of most of the sources found for me by the staff of the library.
①  trace
②  trail
③  track
④  touch
【单选题】 _____ for a long time, the fields are all dried up.
①  There has been no rain
②  Having no rain
③  There having been no rain
④  There being no rain
【单选题】 She often says her greatest happiness _____serving the handicapped children.
①  relies on
②  consists in
③  composes of
④  comprises in
【单选题】 _____ me most was that the young boy who had lost both arms in an accident could handle a pen with his feet.
①  That amazed
②  It amazed
③  Which amazed
④  What amazed
【单选题】 We will be losing money this year unless new economic plan of yours _____miracle
①  is working
②  works
③  will be working
④  worked
【单选题】 If you have never planted anything, you won’t be able to know the pleasure of watching the thing you have planted _____.
①  grow
②  to grow
③  growing
④  to be growing
【单选题】 Following are comments about the behavior that people in Korea usually expect in various social _____.
①  occasions
②  cases
③  situations
④  circumstances
【单选题】 The elbows on your coat have worn thin, so I must _____them.
①  mend
②  patch
③  repair
④  pitch
【单选题】 Mac’s close _____to his brother made people mistake them for one another.
①  resemblance
②  identity
③  appearance
④  relationship
【单选题】 The thieves _____the waste paper all over the room while they were searching for the diamond ring.
①  spread
②  scratched
③  scattered
④  burned