Answer the following statement(s) true (T) or false (F)
1. Endogenous change occurs when the subjects develop or change during an experiment as part of an ongoing process independent of the experimental treatment.
2. A source of causal invalidity known as regression effect occurs when subjects have extreme scores on the dependent variable and the scores become less extreme on the posttest due to the natural cyclical change in the variable.
3. 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.
4. The Hawthorne effect is named after a famous experiment where workers became aware that others had been denied some advantage so they slowed their productivity as a result.
5. In a double-blind procedure, neither the subjects nor staff overseeing the experiment know which subjects are receiving the experimental treatment and which are receiving the placebo.
1. True
2. True
3. True
4. False
5. True
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