SOC 201 Chapter Notes - Chapter 6: Convenience Sampling, Institutional Review Board
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If i drew only one gum ball from the second jar, my sample would be absolutely representative. But if i drew only one gum ball from the first jar, i would miss four of the flavors. I would need at least five different gum balls to accurately reflect the contents of the first jar. So, as a general rule, we can say that the more diverse a population is, the larger the sample needs to be. When you hear about surveys done before elections, for example, you will frequently hear about two sorts: The difference usually has to do with the sampling technique used. Scientific surveys use samples that are drawn according to the rules of random sampling; unscientific surveys use nonrandom sampling techniques. In science, the word random has a specific technical meaning every element in the population has the same probability of being in the sample.
