00:01
We're looking at sampling techniques and we want to match these up to the correct technique.
00:06
So let's go through the techniques.
00:09
We have five of them, starting with cluster.
00:16
Then we have simple random, convenience, systematic, and stratified.
00:32
Okay, so i'm going to go through what each of these are, then it'll be easy for us to match them up to the correct answer.
00:38
I'm going to start with simple random.
00:41
You have your entire population and you just pick at random.
00:46
So you give every member of your population a label, like a number, and you just pick these numbers at random until you have your sample.
00:55
Systematic, you have your population and you pick them at intervals.
00:59
So you pick every nth person.
01:03
You typically get the starting point at random, but then you pick every nth person in your list.
01:10
Convenience is just whatever is easiest.
01:14
So that depends on how you're doing it, but say you wanted to ask people at your university some survey questions.
01:21
Convenience would be to just hang out at the main entrance and ask anyone who comes in.
01:25
You'll be finished really fast.
01:27
It's very easy and cheap to do, but it's probably not representative of the population...