Dependent variables are manipulated, whereas independent variables remain fixed.
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Q7: Which threat to internal validity measures changes
Q8: Internal validity focuses on the rigor of
Q9: Face validity is based on theory, instead
Q10: The Hawthorne effect only applies to threats
Q11: Researchers have control over how many random
Q13: Subject attrition refers to new participants enrolled
Q14: In qualitative and quantitative research, reliability refers
Q15: _ occurs when the results of a
Q16: The _ group within the study receives
Q17: A simple way to calculate sample size
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