Question: For the survey described below, either selection bias or information bias can be operative and has the potential to influence the study validity ? A

For the survey described below, either selection bias or information bias can be operative and has the potential to influence the study validity ? A survey of disability in the elderly based on a sample of senior citizens selected from those attending dance lessons or fitness gyms in Chicago. A. Selection bias B. Information bias C. Neither selection bias nor information bias

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