5. Samples and Surveys
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There are three different sampling methods: random, systematic, and stratified. What are their differences?
Systematic
|
You survey every tenth student who enters the cafeteria. |
The sample consists of every tenth student. Now, let's consider the different sampling methods.
| Name | Sampling Method |
|---|---|
| Random | Survey a population at random. |
| Systematic | Select a number n at random. Then survey every nth person. |
| Stratified | Separate a population into smaller groups, each with a certain characteristic. Then survey at random within each group. |
Since we ask every tenth student who enters the cafeteria, we know that it is a systematic sampling method.