Typically, the people with the highest IQ(from real tests, administered at times like elementary or middle school) seem to be interesting people in general, while also having more success. But yes, with an unacceptable margin of error.
My theory is that IQ measures the ability of somebody to adapt to abstract problems, and recognize what is the most logical path to follow. Now logical doesn't equate to correct, because they might decide the logic based on different ideas of where they want to go.
On top of that, sometimes, there are two both good logical paths, and you're trying to pick the simplest one(in the case of an IQ test) of them. Even though there are multiple correct ones.
And since the correlation shows people with higher IQ's have a slightly larger chance of success(defining success as money, career, etc. Even if that isn't how you decide success, it's what the study meant.) , you can conclude that the higher you score on an IQ test, the more likely that your thinking will make you successful.
Regardless though, the margin of error is too large to say that you have to have a high IQ, and it's also too large to say that a high IQ will make you succeed.