A.原假設(shè)是精確假設(shè)
B.備擇假設(shè)是精確假設(shè)
C.原假設(shè)是非精確假設(shè)
D.備擇假設(shè)是非精確假設(shè)
E.樣本給定
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A.總體中各個個體之間的差異程度
B.樣本容量的大小
C.總體中個體數(shù)的多少
D.樣本的抽取方式
E.抽樣調(diào)查中登記誤差的大小
A.一致性
B.無偏性
C.有效性
D.充分性
E.穩(wěn)健性
A.各組的變量值
B.各組的次數(shù)
C.各組的組中值
D.各組的頻率
E.各組的密度
A.均值大于中位數(shù)
B.均值小于眾數(shù)
C.中位數(shù)小于眾數(shù)
D.均值等于眾數(shù)
E.均值小于中位數(shù)
A.數(shù)學(xué)期望為0
B.標(biāo)準(zhǔn)差為1
C.方差為1
D.偏度系數(shù)為0
E.峰度系數(shù)為3
最新試題
對全國各鐵路交通樞紐的貨運量、貨物種類等進行調(diào)查,以了解全國鐵路貨運概況。這種調(diào)查屬于()
如果居民按報告期價格購買商品需多支出40萬元,報告期商品銷售額為200萬元,則價格指數(shù)為()
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class?()
One rule that must always be followed in constructing frequency distributions is that ().
A summary measure that is computed from a sample to describe a characteristic of the population is called()
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
The number of class intervals in a frequency distribution is usually between ().
Descriptive statistics deals with methods of()
常用的長期趨勢測定的方法有哪些?各有什么特點?
時間序列構(gòu)成因素有哪些?分解的基本原理和思路是什么?