The John Henry effect is a type of contamination in experimental and quasi-experimental designs that occurs when control group members become aware that others are being denied some advantage and they increase their efforts by compensating.
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Q36: A source of causal invalidity that occurs
Q37: If an event such as the murder
Q38: All true experiments have a posttest.
Q39: When comparison group members become aware that
Q40: In order to keep experimental staff from
Q42: Before-and-after designs are types of quasi-experimental designs.
Q43: Endogenous change occurs when the subjects develop
Q44: Social experiments are always conducted in a
Q45: The Hawthorne effect is named after a
Q46: In a double-blind procedure, neither the subjects
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