Facts are not copyrightable, only the presentation of those facts. It is a fact that I have hazel eyes. You can now turn around and say in your article, "Kristen King has hazel eyes" or "According to Kristen King, she has hazel eyes," and you don't need my permission.
And as long as you provide proper attribution, you can quote any source you like. If you're using a lot of material, you want to make sure that it's not too much to go beyond the permissibility of Fair Use, and you might want to check with the author as a courtesy, but when it comes to facts and statistics, you can pretty much just cite the source and go to town.
Just be sure to cite EVERYTHING and make sure your sources are reliable.
Kristen