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Answer :
Final answer:
Using two scales to measure depression in Dr. R's study changes the research design by introducing multiple measures of the same construct. This allows for a better assessment of the changes in depression symptoms due to the therapies. The key focus of such a design is to ensure that both measures accurately reflect the same outcome, supporting the study's validity.
Explanation:
Understanding the Impact of Measurement Methods on Research Design
In the research scenario presented, where Dr. R uses two different scales to measure depression for participants in cognitive-behavioral and mindfulness therapy groups, this modification influences the overall research design significantly. Specifically, this approach introduces multiple measures of the same construct since both scales aim to quantify depression symptoms, albeit in different ways.
Typically, using different scales may suggest a mixed design, but since both measures assess the same construct (depression), it is more accurate to state that it has multiple measures of the same construct. Such a mixed method could help in validating results by allowing a comparison across scales, possibly enhancing the reliability of the findings. However, care must be taken to ensure that the different scales are measuring similar aspects of depression to maintain the validity of the study.
Ultimately, while the design can be classified as having multiple measures, it does not strictly conform to the criteria for a 2x2x2 factorial or mixed design layout as indicated by the potential introduction of variability and more complex interactions between treatment types and scales.
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