I was in a discussion with a man. I've read a study about reading habits. The study shows a low average of read books for some countries and told to a man "most of people doesn't read books" because the average was 6 books a year for a sample taken from a population of 100 millions of people. The man told me, you don't know everyone of the 100 millions, so you can't tell most people don't read. I told him I don't need to know every person, just read the study and see the low average of read books to infer the people needs to read more books. He says the study is incomplete because they don't made the survey on the 100 millions. Is there a kind of fallacy behind his statement? I think the survey is accurate in statistic terms, the study says, "in a country of 100 millions of persons, there is an average of 6 read books a year", I think that's low for this country so I say "most of people don't read books". He for the other side says "you need to know every person to make that statement". Who is right?