A.α
B.β
C.1-α
D.1-β
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A.θ^的數值接近于總體參數θ
B.θ^的期望等于總體參數θ
C.θ^的方差接近于總體參數θ
D.θ^的方差接近于總體方差σ2
A.近似等于θ的量
B.隨機變量
C.數學期望等于θ的統(tǒng)計量
D.方差固定的統(tǒng)計量
A.正態(tài)分布
B.x2分布
C.t分布
D.均勻分布
A.一致性
B.無偏性
C.有效性
D.充分性
A.變量x的標準差
B.變量y的標準差
C.變量x和y兩個標準差的乘積
D.變量x和y的協(xié)方差
最新試題
If the individual class frequency is divided by the total frequency, the result is the ().
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 ().
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,則價格指數為()
Which of the following is not the goal of descriptive statistics?()
最能反映離散程度的指標是()
Which of the following is best to show the percentage of a total budget that is spent on each category of items?()
為什么在計算平均指標的基礎上還有必要進一步計算變異指標?
什么是季節(jié)變動?研究它的意義何在?如何測定季節(jié)變動?
A cumulative frequency distribution would provide().
變量數列中,各組頻率之和應()