A random assignment means that an instructor assigns homework to her students every weekend.
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Q17: Mr.Marsh is so anxious to start his
Q18: A threat that might weaken external validity
Q19: An experimenter's control over an experimental setting
Q20: In an experiment,the group that receives the
Q21: Researchers use deception in all their experiments
Q23: What is the difference between an experimental
Q24: A placebo is an independent variable,typically an
Q25: Natural experiments are field experiments
A)that are always
Q26: In general,social scientists get their best results
Q27: Hawthorne Effect is
A)common in field experiments.
B)awareness of
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