Sandi believes that people who eat at McDonald's are overweight, so she decides to do a naturalistic observation of people who eat at McDonald's. What should most concern us about Sandi's observations?
a) the placebo effect
b) the bystander effect
c) observer bias
d) participant bias
ANS: C, Sandi has a bias about McDonald's customers, which might affect her observations due to a phenomenon known as observer bias.
Psychology
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