If an unexpected event unrelated to the independent variable occurs during the experiment and influences the dependent variable,the experiment suffers a___________threat.
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Q21: Researchers use deception in all their experiments
Q24: A placebo is an independent variable,typically an
Q26: In general,social scientists get their best results
Q31: A researcher should never measure the dependent
Q35: Quasi-experimental design should always be used instead
Q44: Natural experiments are _ experiments that people
Q45: If a researcher accidentally or indirectly communicate
Q46: _ is a threat to external validity;participants
Q52: _ design allows a researcher to test
Q56: _ experimental design has random assignment,a pretest
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