I know so many uneducated guys that are very smart and they would state it that they are smart without education and rub it on

So? This doesn't state that uneducated people aren't smarter then average, 47% are more intelligent than average. What the study states is that despite those 47% which are more intelligent, 50-60% of those uneducated people, think they are more intelligent than average.

Thus that group has a bunch of less intelligent people who think they are more intelligent then they are.

Also "smart" and intelligent are not exactly the same thing IMO. Smart is about what you do with your intelligence, plenty of naturally gifted brains being wasted! IMO.