This is an editable bar graph worksheet (you can add your own questions) and differentiated for gifted students as well (two sets of data--boy/girl).
Students will come up with their own survey questions and then survey the class and collect data to make their own graph, then answer questions based on their graph.
When I did this lesson, I had students write down three questions on the day before the actual bar graph lesson so that I could pick one that would make most sense on a bar graph. Y