【多选题】【消耗次数：1】
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
①
可确定两变量之间因果的数量关系
②
可确定两变量的相关方向
③
可确定两变量的实际值与估计值的变异程度
④
可确定两变量相关的密切程度
⑤
可确定当自变量的增加一个单位时，因变量的平均增加值
参考答案：
复制
纠错
相关题目
随机题目
【单选题】
—WhatdoyouthinkmadeMarysoupset?—______herbicycle.
①
As she lost
②
Lost
③
Losing
④
Because of losing
【单选题】
—She may not be free today.—________, well have to put the meeting off.
①
If may
②
If not
③
If she may not
④
If she may not be free today
【单选题】
—Doyouthinkitsgoingtorainovertheweekend?—_______.
①
I dont believe
②
I dont believe it
③
I believe not so
④
I believe not
【单选题】
—Is your mother going to the supermarket?—No, _______.
①
she doesnt
②
shes cooking
③
she gets by bus
④
to a tailors shop
【单选题】
The position of a grandparent is easier than ______ of a parent.
①
ones
②
this
③
that
④
it
【单选题】
Itsnouse_______menottoworry.
①
you tell
②
your telling
③
for you to have told
④
having told
【单选题】
Ifyouwant______youhavetogetthefundsomewhere.
①
that the job is done
②
the job done
③
to have done the job
④
the job that is done
【单选题】
While _______ the sun, the satellite has sent more than four billion bits of information back to earth.
①
having orbited
②
being orbited
③
having been orbited
④
orbiting
【单选题】
Theyareconsidering______beforethepricesgoup.
①
of buying the house
②
with buying the house
③
buying the house
④
to buy the house