If you want to make sure that all ethnic groups are systematically represented in your sample, you should use:

Name: If you want to make sure that all ethnic groups are systematically represented in your sample, you should use:
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Stratified random sampling involves dividing the population into subgroups based on relevant characteristics (in this case, ethnicity) and then randomly sampling from each subgroup. This ensures that each ethnic group is represented proportionally in the sample.

If You Want to Make Sure That All Ethnic Groups