What your child will learn from this project: I think this is a great project idea because it teaches graphing, surveying and getting an average.
It also teaches public communication skills, "Hi My name is Hayden I am doing a survey can I ask you a quick question?" politeness, and real socialization skills, Imagine that lol!
Your kids can do this project as well they can pick what ever topic they choose to conduct their survey, for older kids they can choose a topic suitable for them my son is six so favorite color is appropriate.
Just make sure you are with your children supervising them, because this project requires talking with other people you and child may not know.
Thanks for reading!
To Your Success!