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【多选题】
直线回归方程yc=a+bx中的b称为回归系数,回归系数的作用是( )A.
可确定两变量之间的相关程度
B.
可确定两变量之间的相关方向
C.
可确定因变量的实际值与估计值的变异程度
D.
可确定当自变量增加一个单位时，因变量的平均增加值
E.
可确定当自变量为０时，因变量的起点值
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】These_______want to have some fish for lunch ，so they decide to catch many ________
A.
Germans；fishes
B.
Gremans；fish
C.
Germen；fishes
【单选题】已知一函数的形参说明为int arr[5][6]，则与此等效的形参说明为
A.
int arr[][]
B.
int[5][]
C.
int*a[6]
D.
int(*a)[6]
【简答题】已知a：b=3：5，a：c=6：7，则a：b：c=______．
【单选题】These Germans want to have some _____ for supper, so they decide to catch _____ now. [ ]
A.
fish; some
B.
fishes; much
C.
fish; much
D.
fishes; many
【单选题】The _____ want to have some _____ for lunch, so they decide to catch some.
A.
Germans, fish
B.
Canadian, fish
C.
Germany, fish
【单选题】We have some chicken，but we _____ fish. [ ]
A.
have some
B.
have any
C.
don't have any
D.
don't have some
【简答题】Some fish have a greater ________ for acid water than others. A) tolerance B) resistance C) dependence D) persistence
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