Mrs Grundy believes that boarding schools provide the best education because after attending such a school, she found herself well-prepared for college. The fallacy in her thinking is the "hasty generalization".
What is a Hasty generalization?
A hasty generalization is a fallacy in which a conclusion is reached based on insufficient or incomplete information. They are based on anecdotal or isolated evidence. It's also called an insufficient sample, a faulty generalization, a biased generalization, or jumping to a conclusion.
There is a lack of evidence to back up Mrs Grundy's assertion since her own experience is just one out of many possible experiences at a boarding school. Another reason that shows her argument is a fallacy is that her experience might not be universal. She is merely assuming that everyone will have a similar experience in a boarding school, which is not necessarily the case.
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