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【单选题】
在假设检验中，如果两个正态总体的均值和方差均为未知，现要求关于两个正态总体均值的假设检验，必须选用( )检验σ 1 是否等于σ 2 然后再选用( )完成对均值的假设检验。A.
F检验法，u检验法
B.
u检验法，t检验法
C.
F检验法，t检验法
D.
u检验法，χ 2 检验法
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举一反三
【单选题】On the left side of the root of the neck the thoracic duct turns laterally to pass between these two structures
A.
phrenic nerve and the prevertebral fascia
B.
anterior and middle scalene muscles
C.
anterior primary rami of C8 and T1
D.
common carotid artery and vertebral artery
【简答题】Roger Sperry and Robert Ornstein of the California Institute of Technology won a Nobel Prize in 1972. They discovered that the human brain has two sides, and each side has different work to do. The le...
【简答题】常见的大型关系型数据库产品:甲骨文公司的 _______,IBM公司的_______ ,Microsoft公司的_______ 和Sybase公司的ASE等。(请全部小写,单词之间不要加空格)
【简答题】Please match the answer on the left side with the people on the right side. 1. T he nickname of ______ is “the grandmother of Europe”. A. George V 2. The house of Windsor starts from _________. B. P...
【单选题】In________ , drivers don ’ t drive on the left side of the road .
A.
the UK
B.
The US
C.
Australia
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