A.算術表達式
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)結構完全相同
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
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
在組距數(shù)列中，下限就是（）
時間序列構成因素有哪些？分解的基本原理和思路是什么？
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（）
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 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 （）.
一個地區(qū)一定時期的商品零售額屬于（）
The number of class intervals in a frequency distribution is usually between （）.
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 （）.
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). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.