【单选题】【消耗次数：1】
相关分析与回归分析相比，对变量的性质要求是不同的，回归分析中要求
①
自变量是给定的，因变量是随机的
②
两个变量都是随机的
③
两个变量都是非随机的
④
因变量是给定的，自变量是随机的
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相关题目
【单选题】
在回归分析中，自变量同因变量地位不同，在变量x与y中，y依x回归同x依y回归是?
①
同一个问题
②
有联系但意义不同的问题
③
一般情况下是相同的问题
④
是否相同，视两相关变量的具体内容而定
【多选题】
为了使自变量和因变量高度相关，应做到（ ）。
①
只选一个因素做自变量
②
与因变量有高度相关关系的因素都选为自变量
③
与因变量没有相关关系的因素都不选为自变量
④
与因变量只有低度相关关系的因素都不选为自变量
随机题目
【单选题】
I ___ go to bed until I ___ finished my work last night.
①
don’t; had
②
didn’t; have
③
didn’t; had
④
don’t; have
【单选题】
—Look, someone is coming. Guess who it ___ be?—I think it ___ be Tom.—I don’t think it ___ be ___.
①
?must; can; must; his
②
?may; can; must; him
③
?can; must; can; him
④
?might; must; can; himself
【单选题】
I was told yesterday that the company ___ me to Rome next week for a business conference.
①
?should have sent
②
?was going to send
③
?should be sending
④
?should send
【单选题】
If it is fine tomorrow, we ___ a football match.
①
have
②
will have
③
has
④
shall has
【单选题】
I went to the doctor’s yesterday. I had to wait for half an hour before he ___ see me.
①
?can
②
?may
③
?might
④
?could
【单选题】
If they ___ to do this work, he might do it some other way.
①
were
②
should
③
will
④
can
【单选题】
He was a good swimmer so he ___ swim to the river bank when the boat sank.
①
could
②
might
③
should
④
was able to
【单选题】
No sooner ___ he arrived home than he ___ to start on another journey.
①
has; was asked
②
have; were asked
③
had; is asked
④
had; was asked
【单选题】
This book is ______ that one, but ______ than that one.
①
as difficult as; expensive
②
as more difficult as; more expensive
③
as difficult as; more expensive
④
more difficult as; as expensive