Testing effect is a problem when change in the measuring instrument is made between pretest and posttest.
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Q5: Reliability can be tested in several methods,
Q6: Natural disaster or climate change is the
Q7: History is the most difficult threat to
Q9: Because of statistical regression, it is important
Q10: The best way to overcome selection bias
Q11: Diffusion of treatment in regards to validity
Q12: More than one threat to internal validity
Q13: The Hawthorne effect and placebo effect are
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