A.算術(shù)表達式
B.條件表達式
C.變量
D.函數(shù)
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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
A.待合并的兩個數(shù)據(jù)文件的數(shù)據(jù)結(jié)構(gòu)完全相同
B.可以是兩個完全不相干的數(shù)據(jù)文件
C.在兩個數(shù)據(jù)文件中，數(shù)據(jù)含義相同的數(shù)據(jù)項最好起相同的變量名
D.待合并的兩個數(shù)據(jù)文件的個案數(shù)相同
最新試題
A cumulative frequency distribution would provide（）.
對某班級學(xué)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（）
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(shù)為（）
在組距數(shù)列中，下限就是（）
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 （）.
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（）
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 （）.
變量數(shù)列中，各組頻率之和應(yīng)（）
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？（）
為什么在計算平均指標的基礎(chǔ)上還有必要進一步計算變異指標？