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
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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)學期望為0
B.標準差為1
C.方差為1
D.偏度系數(shù)為0
E.峰度系數(shù)為3
A.數(shù)學期望為p
B.數(shù)學期望為q
C.方差為p+q
D.方差為pq
E.方差為p/q
最新試題
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 approximate range of the number of phone calls arriving each hour?()
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個車間,這四個車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少?
最能反映離散程度的指標是()
A cumulative frequency polygon is also called ().
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of ().
常用的長期趨勢測定的方法有哪些?各有什么特點?
要了解某地區(qū)全部大學生的就業(yè)情況,那么()
變量數(shù)列中,各組頻率之和應()
If data are grouped into intervals and the number of items in each group is listed, this could be called a ()
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()