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17 March, 16:29

Professor Newberg decided to study the social activity level of senior citizens, so he visited a local retirement village and invited residents to participate in a lengthy survey. Professor Newberg's survey results are probably invalid because he did not use:

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  1. 17 March, 16:33
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    Answer: A random selection of participants.

    In order for professor Newberg's survey to be considered valid, he should have had a random selection of participants, instead. By doing so, all members would have an equal chance of being included in the study.
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