Babbel, a language learning app wants to make a large$-$scale update to their learning system. They want to test if the new system is a more effective way for people to learn a new language.

They get $120$ participants and let each of them choose if they want to use the original app or the new updated version. The participants also choose one of five available languages to learn. $70$ participants chose to use the original app and $50$ chose to use the new app.