What is the favorite color?

unfortunately there is no valid answer to this question. People can suggest their favorite color but you're asking a collective group a favorite thing. Favorite being subjective to the individual. So such a task of asking an entire population their "favorite" color is not a question that has a single answer.

Now if the question was worded in a way whereas what color is most popular regarding the human race is the following: The most popular color in the world is blue. The second favorite colors are red and green. This information was performed by sending out surveys to a variety of groups around the globe.