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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 （）.
對某班級學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）
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？
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？（）
A cumulative frequency polygon is also called （）.
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？（）
Descriptive statistics deals with methods of（）
Which of the following statements is not true？（）
If the individual class frequency is divided by the total frequency, the result is the （）.
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）