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【多选题】
下列关于标准差σ,说法正确的是( )。A.
σ值愈大,曲线愈平坦,即随机变量的分散性愈大;
B.
标准差σ 刻划总体的分散程度。
C.
标准差σ是评定算术平均值的可靠性指标。
D.
σ值愈小,曲线愈尖锐(集中),随机变量的分散性愈小。
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举一反三
【单选题】His speech was so ________ that we were all ________ with it.
A.
boring; boring
B.
bored; bored
C.
bored; boring
D.
boring; bored
【简答题】茎皮纤维发达的树种?
【单选题】His speech was so ___ that even his opponents were won over by his arguments.
A.
blunt
B.
convincing
C.
emphatic
D.
determined
【单选题】Despite the strike vote, a few workers________ the majority decision and returned to work.
A.
have defied
B.
have denied
C.
have realized
D.
have researched
【简答题】Despite the strike vote, a few workers have _____ ( 违抗;不服从 ) the majority decision and returned to work.
【单选题】His speech was so ___________ that it makes me feel __________.
A.
boring; sleepy
B.
boring; asleep
C.
bored; asleep
D.
bored; sleeping
【单选题】a few workers have _________ the majority decision and gone into work despite the strike.
A.
defied
B.
destined
C.
detained
D.
deferred
【单选题】His speech was so ___________ that it makes me feel __________.
A.
bored; asleep
B.
boring; asleep
C.
boring; sleepy
D.
bored; sleeping
【简答题】His speech was so welcome that it was ______ (不断被掌声所打断)．
【单选题】His speech was so interesting that it was constantly _________ by applause.
A.
interfered
B.
interrupted
C.
trouble
D.
disturbed
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