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Are soccer players who head the ball often more likely to get concussions? Each player in a soccer league will be followed for an entire

Are soccer players who head the ball often more likely to get concussions? Each player in a soccer league will be followed for an entire season. Players will be classified as frequent or infrequent headers. The number of concussions for each player will be recorded as well. Is this an observational study or an experiment? Explain your reasoning.

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