I usually do this acitivity with younger classes from our building, but I only had one response this year.

What r u lookin to do? Do you want your class to graph responses from the other group?

you could use a google form as well

we usually collect data from some sort of question form (could do that in google docs) then create the different kinds of graphs to present

This is easy stuff like what is your favorite color then graph on a bar graph.

cool, if you would like to connect to any of my classes just let me know