Statistics: Sample vs. Population Mean

未能成功加载,请稍后再试
0/0

Before, at the end of the last video, I actually said that we'd talk about measures of dispersion or how things are distributed, but before I go into that, I realize that I have more to talk about, especially the mean.

And before I do that, I want to differentiate between a sample and a population.

I touched on this a little bit in the last video.

Let's say I wanted to know-- I don't know.

Let's say I wanted to know the average height of all men in America, right?

So let me make the set of all men in America.

So that's all men in America.

I know there's 300 million people in the U.S., and half of them maybe roughly are men, so this would be 150 million men, right?

And it would be nearly impossible, even if I was intent on doing it, to actually measure the average height of every man in America.

Frankly, you know, every few seconds, one of these men is being born and one of these men is dying.

下载全新《每日英语听力》客户端,查看完整内容