When a pollster uses simple random sampling to select a sample of 100 individuals from a complete list of all registered voters in a city, what is the defining characteristic of this selection process?

A classic application of simple random sampling can be seen when a pollster starts with a complete list of all registered voters in a city, which represents the entire population. The pollster then randomly selects $$100$$ individuals from that list to form the sample and asks them whom they intend to vote for, ensuring each voter had an equal chance of being chosen.

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Simple random sampling is a method for obtaining a study sample where every single member of the target population has an equal chance of being selected. While this approach is effective for ensuring a representative sample, it is often difficult or impossible to achieve in psychological research because populations are rarely defined clearly enough to give everyone an equal selection chance.

Simple Random Sampling

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KPU Research Methods in Psychology - 4th American Edition

Example of Simple Random Sampling: Pollster

A representative sample is a study sample that is similar to the broader population in important respects. It is crucial for researchers to obtain a representative sample so they can appropriately generalize their findings from the small subset of participants to the entire population of interest.

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