Does stereotyping bring more attention to group members similarities or differences?

Answer 1

Wouldn't it depend on the group and which sterotype?

For example, 12 blond cheerleaders and one spacy blond muslim male cheerleader in a group.

Now exactly which sterotype are you refering to?
Spacy, empty headed, males, female. blondes, rahrahs...and the list goes on.

Answer 2

Stereotyping assumes that all members of a particular group possess the same characteristics.

http://www.members.cox.net/dagershaw/lol/Prejudice.html

I hope this helps a little more.