Which of the following descriptions best suits the use of a random sample in polling?
  1. Only computers select who is called.
  2. Complex math models in computer programs determine calls.
  3. Any person in the population has an equal chance at being called.
  4. No predetermined criteria are used for calls.
Explanation
Answer: C - Of these possibilities, the use of a random sample in polling is best described as any person in the population has an equal chance at being called. Randomness is the most difficult part of good polling. The notion of random polling assumes that the polling group knows all of the population potentially being polled, how many people there are in that population, and where they are. For a sample to truly be random, all of these basic conditions must be met.
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