Judging a Target Audience

Here are a few things that should be considered when choosing an appropriate target audience which i found on this website;

http://avenueright.com/entries/75/10-questions-that-help-define-a-target-audience

Who buys your product?	What media do they use most often?
Are they predominately female or male?	What's the general attitude toward the product or service?
From what age group?	Education level?
What are their spending habits?	What are their product needs?
What's their geographic location? Local? Regional?	Lifestyle indicators (home, automobile ownership, for example)?