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
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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
A.數(shù)學(xué)期望為p
B.數(shù)學(xué)期望為q
C.方差為p＋q
D.方差為pq
E.方差為p/q
A.概率分布表
B.概率分布圖
C.概率分布函數(shù)式
D.回歸函數(shù)式
E.方差分析表
A.柱狀圖
B.直方圖
C.折線圖
D.散點(diǎn)圖
E.立方圖
最新試題
One rule that must always be followed in constructing frequency distributions is that （）.
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（）
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？（）
要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）
以2000年a0為最初水平，2016年an為最末水平，計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí)，須開（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于（）
Which of the following is not the goal of descriptive statistics?（）
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is 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 （）.