A.屬性化
B.數(shù)量化
C.同質(zhì)化
D.差異化
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A.等于0
B.等于總平方和
C.完全由觀測的隨機(jī)誤差引起
D.完全由各因子水平的差異引起
A.必然事件
B.不可能事件
C.小概率事件
D.大概率事件
A.原假設(shè)為真的條件下檢驗(yàn)統(tǒng)計(jì)量的概率分布
B.備擇假設(shè)為真的條件下檢驗(yàn)統(tǒng)計(jì)量的概率分布
C.觀測變量的總體概率分布
D.觀測變量的樣本分布
A.α
B.β
C.1－α
D.1－β
A.θ^的數(shù)值接近于總體參數(shù)θ
B.θ^的期望等于總體參數(shù)θ
C.θ^的方差接近于總體參數(shù)θ
D.θ^的方差接近于總體方差σ2
最新試題
某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組，請指出哪項(xiàng)是正確的（）
對全國各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查，以了解全國鐵路貨運(yùn)概況。這種調(diào)查屬于（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
常用的長期趨勢測定的方法有哪些？各有什么特點(diǎn)？
Which of the following statements is not true？（）
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？（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
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 （）.
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？（）
If the individual class frequency is divided by the total frequency, the result is the （）.