Discussion
Why is random sampling preferred ?
Answer: B
Random sampling is preferred because the results will be statistically valid.
In a random sample every member of the population has a known, usually equal, chance of selection. This removes the investigator's bias in choosing units, makes the sample representative on average, and allows the laws of probability to be used to estimate sampling error and draw valid inferences about the population.
It is not preferred for being easy to draw, since it needs a complete list of the population. Being popular is not a statistical reason, and it is not free from errors: sampling error remains, though it can be measured.
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