對某班級學(xué)生的生活狀況進行統(tǒng)計調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）

Descriptive statistics deals with methods of（）

變量數(shù)列中，各組頻率之和應(yīng)（）

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

一個地區(qū)一定時期的商品零售額屬于（）

One advantage of a stem and leaf plot over a frequency distribution is that （）.

If the individual class frequency is divided by the total frequency, the result is the （）.

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 （）.

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

One rule that must always be followed in constructing frequency distributions is that （）.