Kahoot!
Kahoot! is an engaging, handy tool that students can use to create in-class questionnaires and quizzes. This is handy for obtaining data for graphing assignments, data for research essays, and feedback from their classmates. Kahoot! is compatible with multiple devices and has a game-like feel that will help keep students interested.
This would be a great tool to use in stats classes which students need the most help.
Education for 21st century 