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Example 1.14 from Statistics, 1.2 Data, Sampling, and Variation in Data and Sampling
c. Is the sample biased?
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
c. The sample is unbiased, but a larger sample would be recommended to increase the likelihood that the sample will be close to representative of the population. However, for a biased sampling technique, even a large sample runs the risk of not being representative of the population.
Students often ask if it is good enough to take a sample, instead of surveying the entire population. If the survey is done well, the answer is yes.
How did it go?