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There are a variety of correct answers to this question. Some possible answers include:
I would want to know the question that was asked. If the question was biased, then I would not accept the results produced.
Also, I would want to know if the dentists had an incentive for saying they did like this type of toothpaste. For example, the sample would not be valid if dentists who said they liked the toothpaste received free toothpaste.
I would want to know the size of the sample. If they only asked five dentists, for instance, I would question the results.
