Shyla conducted an experiment. She went to the student union and asked people if they would like to be subjects in her study. She decided to ask only those people who smiled at her. Is this an appropriate way to select subjects?
A. Yes-since these individuals smiled and are likely to be cooperative
B. Yes-the student union has a diverse group of people
C. No-it is not random selection
D. No-Shyla failed to assign her subjects to groups first
Answer: C
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