PLEASE EXPLAIN THIS QUESTION 5.19 Explain any possible flaws in this conclusion

Question

PLEASE EXPLAIN THIS QUESTION

5.19 Explain any possible flaws in this conclusion [18]:

A drinker consumes more than twice as much beer if it comes in a pitcher than in a glass or bottle, and banning pitchers in bars could make a dent in the drunken driving problem, a researcher said yesterday. Scott Geller, a psychology professor at Virginia Polytechnic Institute and State University in Blacksburg, Va., studied drinking in three bars near campus. [O]n average, bar patrons drank 35 ounces of beer per person when it came from a pitcher, but only 15 ounces from a bottle and 12 ounces from a glass.

Explanation / Answer

here the sample selected is not random,it is biased.Here selection bias has occured.In the bars near college campus there will be mostly young people.So adequate no representetive of each age group is not present in the sample. Hence the sample has selection bias.The sample should have equal no of observations from each age group.

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