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，在大樣本情形下近似服從標準正態(tài)分布.
最新試題
時間序列構成因素有哪些？分解的基本原理和思路是什么？
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
某班的學習按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
常用的長期趨勢測定的方法有哪些？各有什么特點？
A cumulative frequency distribution would provide（）.
The number of class intervals in a frequency distribution is usually between （）.
某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組，請指出哪項是正確的（）
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？（）
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 （）.
A cumulative frequency polygon is also called （）.