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100% correct. I was working on a project once which was related to Bank data , the exact same thing happened . Our guide was so bad , he told to just pick 100 random data out of 1 million data and do the analysis , it sucked lol . It was totally off .

That's when I learnt , training model is very important and methods to choose that should be ideal.

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Yes, that's where the bias kicks in. Because we don't have a lot of diverse point of views curating the data that feeds the models, they end up "flawed"

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