4. The population is the entire group being studied. The sample is the part of the population being surveyed. A biased sample means it is not good representation of the sample. (Unfair)
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8. To get accurate information, it is important to use a good sampling method. In a random sample, every member of the population has an equal chance of being chosen. A random sample is best, but other methods are often used for convenience. Sampling Method How members are chosen Random By chance Systematic According to a rule or formula Stratified At random from randomly chosen subgroups
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