A.平均差大于標準差
B.平均差小于標準差
C.平均差等于標準差
D.二者關(guān)系不定
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A.左偏分布
B.右偏分布
C.對稱分布
D.均勻分布
A.0
B.1
C.-1
D.0.5
A.眾數(shù)
B.中位數(shù)
C.極值
D.均值
A.簡單算術(shù)平均數(shù)
B.加權(quán)算術(shù)平均數(shù)
C.簡單調(diào)和平均數(shù)
D.加權(quán)調(diào)和平均數(shù)
A.兩點分布
B.二項分布
C.超幾何分布
D.泊松分布
最新試題
One advantage of a stem and leaf plot over a frequency distribution is that （）.
One rule that must always be followed in constructing frequency distributions is that （）.
A cumulative frequency distribution would provide（）.
常用的長期趨勢測定的方法有哪些？各有什么特點？
以2000年a0為最初水平，2016年an為最末水平，計算鋼產(chǎn)量的年平均發(fā)展速度時，須開（）
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？（）
對某班級學生的生活狀況進行統(tǒng)計調(diào)查，下列標志中屬于不變標志的是（）
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 （）