证券分析人员为了研究资金运用效率对制造商收益的影响，随机抽取了5个公司，得到如下资料：
要求计算：
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A.第一类错误被称为弃真错误
B.第一类错误被称为纳伪错误
C.第二类错误被称为纳伪错误
D.第二类错误是原假设不正确，但却被接受的错误
E.第一类错误是原假设正确，但却被拒绝的错误
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某企业2018年技术工占50%，2019年新招收了一批学徒工，使学徒工的比重增加了10%。假定全厂各级工资水平均无变化，则2019年职工总平均工资将（）
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 （）.
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？（）
如果居民按报告期价格购买商品需多支出40万元，报告期商品销售额为200万元，则价格指数为（）
A cumulative frequency polygon is also called （）.
One rule that must always be followed in constructing frequency distributions is that （）.
Which of the following statements is not true？（）
对某班级学生的生活状况进行统计调查，下列标志中属于不变标志的是（）
什么是季节变动？研究它的意义何在？如何测定季节变动？