Which is the real problem, you can't vote with certainty that one choice is right. This is one of the most complex, toughest, decisions ever.
There are so many variables that even deciding which would be the better option is impossible. There are plenty of dodgy statistics and personal preferences flying around but there is really very little 'informed choice'. Without hard facts, and there aren't any, the politicians and statistics wizards are just spouting personal belief.
The problem is there can't be, you are taking a huge box of dice and throwing the lot. Each individual die can have a disproportionate effect on the result. We might end up better off, or worse off.
Without that both sides are effectively reduced to scaremongering. The polls are entirely neutral 43 in - 42 out - 15 undecided. It could really go either way.
http://www.bbc.co.uk/news/uk-politics-eu-referendum-36271589