A.頻數(shù)
B.百分比
C.有效百分比
D.累計百分比
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A.算術表達式
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C.變量
D.函數(shù)
A.分類變量
B.分組變量
C.匯總變量
D.目標變量
A.If condition is satisfied
B.Random sample of cases－Approxomately
C.Use filter Variable
D.Random sample of cases－Exactly
A.計算三門課程成績的平均分
B.計算三門課程成績的標準差
C.計算三門課程成績的方差
D.計算三門課程成績的總分
A.Both file iprovide cases
B.External file is keyed table
C.Working data file is keyed table
D.Indicate case source as variable
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對全國各鐵路交通樞紐的貨運量、貨物種類等進行調(diào)查，以了解全國鐵路貨運概況。這種調(diào)查屬于（）
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 （）.
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（）
一個地區(qū)一定時期的商品零售額屬于（）
要了解某地區(qū)全部大學生的就業(yè)情況，那么（）
最能反映離散程度的指標是（）
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？
某企業(yè)2018年技術工占50%，2019年新招收了一批學徒工，使學徒工的比重增加了10%。假定全廠各級工資水平均無變化，則2019年職工總平均工資將（）
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？（）