1) Would you be more likely to show interest in an organization with more established chapters as opposed to one with fewer?
One with more because to me part of the allure of a sorority is knowing you have sisters all over the place.
2) Would you show more interest in an organization with large numbers as opposed to one with small numbers?
More. Because size is most associated with strength.
3) Would you prefer to join an organization that has been around for longer but had few chapters?
That's a tough one. I think not because I would wonder why they hadn't grown.
4) Did the organization’s colors or website affect your interest level?
When I rushed there was no Internet (

), but if there had been I almost certainly would have been swayed by the quality of the website. I think that today that is a very important aspect which is why I wish my sorority had a website to compare to, for example, Tri Delta's or Delta Gammas.
As for colors, the fact that I like pink and green was just a pleasant bonus.
5) What was it about the organization that you chose that interested you?
The strength of my sorority on my campus is what made me choose to pledge there. I didn't know much about the national size/reputation back then. Now, as an alum, I'm happy to know that we have a strong alumnae network as well.