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Which of the following statements is not true？（）
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 approximate range of the number of phone calls arriving each hour？（）
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
The number of class intervals in a frequency distribution is usually between （）.
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
變量數(shù)列中，各組頻率之和應(yīng)（）
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？
Which of the following is not the goal of descriptive statistics?（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）