A.精確假設(shè)
B.非精確假設(shè)
C.復(fù)合假設(shè)
D.備擇假設(shè)
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A.28.35小時
B.28.59小時
C.29.61小時
D.30.02小時
A.變量x的標(biāo)準(zhǔn)差
B.變最y的標(biāo)準(zhǔn)差
C.變量x和y兩標(biāo)準(zhǔn)差的乘積
D.變量x和y的協(xié)方差
A.算術(shù)平均數(shù)
B.中位數(shù)
C.眾數(shù)
D.調(diào)和平均數(shù)
A.2個
B.3個
C.4個
D.5個
A.任意調(diào)查
B.立意調(diào)查
C.配額抽樣
D.整群抽樣
最新試題
The number of class intervals in a frequency distribution is usually between ().
某班的學(xué)習(xí)按考試成績分為60分以下,60-70,70-80,80-90,90-100,這種分組()
Which of the following is not the goal of descriptive statistics?()
Descriptive statistics deals with methods of()
某廠某年職工勞動生產(chǎn)率為20000元,是歷史最高水平的1.2倍。這里的1.2倍是()
在組距數(shù)列中,下限就是()
If the individual class frequency is divided by the total frequency, the result is the ().
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
A cumulative frequency polygon is also called ().
變量數(shù)列中,各組頻率之和應(yīng)()