變量數(shù)列中，各組頻率之和應(yīng)（）

Which of the following statements is not true？（）

A summary measure that is computed from a sample to describe a characteristic of the population is called（）

某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級(jí)工資水平均無變化，則2019年職工總平均工資將（）

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 （）.

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 cumulative frequency of the third class？（）

時(shí)間序列構(gòu)成因素有哪些？分解的基本原理和思路是什么？

以2000年a0為最初水平，2016年an為最末水平，計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí)，須開（）

The number of class intervals in a frequency distribution is usually between （）.

在組距數(shù)列中，下限就是（）