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snow666_6 · 2020年02月14日

问一道题:NO.PZ2017092702000148

问题如下:

Which of the following groups best illustrates a population?

选项:

A.

The 500 companies in the S&P 500 Index

B.

The NYSE-listed stocks in the Dow Jones Industrial Average

C.

The Lehman Aggregate Bond Index as a representation of the US bond market

解释:

A is correct. A population is defined as all members of a specified group. The S&P 500 Index consists of 500 companies, so this group is the population of companies in the index.
B is incorrect because there are several Dow Jones component stocks that are not traded on the NYSE, making the NYSE group a subset of the total population of stocks included in the Dow Jones average.
C is incorrect because although the Lehman Aggregate Bond Index is representative of the US bond market, it is a sampling of bonds in that market and not the entire population of bonds in that market.


这个考察的考点是什么?没太懂其他两个为什么不选

1 个答案

星星_品职助教 · 2020年02月14日

同学你好,

这道题是在考察population和sample的区别,用了一些指数做背景。这些指数了解即可。

S&P 500就是一共由500个公司构成的指数,所以全部500家都包含了,就是总体的概念。

道琼斯工业平均指数只包含30家大公司。The Lehman Aggregate Bond Index 里并没有包含美国所有的债券。所以都是sample的概念。