“Magic Hat Brewery recently released the results of a survey of visitors to its tasting room last year. Magic Hat reports that the majority of visitors asked to taste its low-calorie beers. To boost sales, other small breweries should brew low-calorie beers as well.”
书上说是The source of the news is not dependable，说他抽样的程序没有随机性。不懂啊？？？
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