Rodell wants to find the favorite gaming app among the students at his school. He decides to poll the thirty students on his football team and the fifteen students on his basketball team to gather the data. What is wrong with Rodell’s method for collecting his data?

Rodell wants to learn what all students at his school prefer, but he surveyed only students on two sports teams. Athletes may have different preferences from students who do not play sports, so his sample may not represent the whole school. The key problem is who he polled, not simply the sample size or the sports seasons.

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