品合格率指標(biāo)是（）

Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）

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？

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

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 （）.

變量數(shù)列中，各組頻率之和應(yīng)（）

Descriptive statistics deals with methods of（）

如果居民按報告期價格購買商品需多支出40萬元，報告期商品銷售額為200萬元，則價格指數(shù)為（）

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

對全國各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查，以了解全國鐵路貨運(yùn)概況。這種調(diào)查屬于（）