"The real question ... is the chosen sample biased or not? ... and you can't answer with a yes/no just because the survey was done on Facebook"
yes, you can. it is clearly biased because (a) the sample was not randomly selected from the full set of iPad users and (b) the sample was a self-selected group of people who actively wanted to record their opinions on a general quiz.
its not a random sample. hence it is biased.
electoral polls, the ones that tend to be pretty accurate, work very hard to get a random sample. You did not.
yes, you can. it is clearly biased because (a) the sample was not randomly selected from the full set of iPad users and (b) the sample was a self-selected group of people who actively wanted to record their opinions on a general quiz.
its not a random sample. hence it is biased.
electoral polls, the ones that tend to be pretty accurate, work very hard to get a random sample. You did not.