I'm skeptical of this list, because I don't know of objective measurements for any of these. Anybody can believe they are "curious". In fact, we would probably describe most dogs as curious too, but does that help their creativity? Are we talking about an absolute measurement here or a relative measurement?
Secondly, many of these characteristics likely depend on circumstances. Under some circumstances, you may be more optimistic than average. However, in a different situation you may be less optimistic than most.
Sorry, I don't buy this. It's sort of like asking people if they are "above-average drivers". Most people will say "yes" and they would all be right, because they are all using different criteria to evaluate the term "above-average driver".
I think the key would be to ask oneself not if you have above-average creativeness, but take each item on the list and think about them individually. I would think that if you're smart enough to determine that the test isn't exactly scientific, you're smart enough to at least estimate your own abilities.
For myself, I would definitely consider myself more curious than the average person. I read.... CONSTANTLY. I'm on wikipedia, googling, reading the news and tech sites, reading tutorials on how to do things (like 3d model, or video edit, etc). I estimate I'm more curious about the world and specifically about my areas of expertise than the people I work and interract with on a regular basis. I just look at reality TV and... well, I guess I know about the rest of the USA too.
Just be technical enough to think about each item, but take everything with a grain of salt.