And so all the pieces of paper go in there and then you put a blindfold on someone and they can't feel what names are there and so they should pick out the first 30 without replacing them because you obviouslyĭon't wanna pick the same, you don't wanna pick So I'll try to draw a little, I don't know, that looks likeĪ fish bowl or something. Very basic way of doing it but it's actually a pretty effective way of getting a simple, of getting a simple random sample. They all should be the same size and then you throw them all, you throw them all intoĪ bowl of some kind and this seems like a Paper gets the next person and you're gonna go all the way down so you're gonna have 80 pieces of paper. They're on a slip of paper then the next slip of So let's say this is alphabetically the first person in the school. One way to do it is associate every person in your school with a piece of paperĪnd put 'em all in a bowl and then pick 'em out so let's do that. Select those 30 students and how do I select it so that I feel good that it is actually random? And there's several ways So once you decide to do this, you say, well, how do I Take their average height and say, well, that's probablyĪ pretty good estimate for the population parameter for the average height You think it's reasonableįor you to measure the heights of 30 of these students and so what you wannaĭo is randomly sample 30 of the 80 students and The height of all 80 students so you decide to find a simple or take a simple random sample. You think it's too hard for you to go and measure Of the average height in your population and So there's 80 students in your population and you wanna get an estimate Let's say that your school has a population of 80 students in it.
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