What is great about random samples is that you can generalize to the population that you are interested in. So if you sample 500 households in your community, you can generalize to the 50,000 households that live there. Think of a sample as a slice of the whole pie. If you match some of the demographic characteristics of the 500 with the 50,000, you will see that they are surprisingly similar. That is the beauty of a sample!
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