11. Contrasting a repeated-measures research design with matched-subjects and in

Question

11. Contrasting a repeated-measures research design with matched-subjects and independent-measures designs Aa Aa A graduate student is interested in whether journaling can affect grief and healing. He has participants who have been widowed within the past 10-14 months complete a battery of psychological questionnaires before and after spending 2 months journaling about their emotions. The first time the graduate student conducted this study, he used a repeated-measures design and compared the widows' and widowers' baseline scores with their scores after the 2 months of journaling. However, his results were criticized because some argued that the observed changes in scores could have been attributed to time elapsed rather than being attributed to any effect of the 2 months of journaling. Which of the following are better designs for investigating whether journaling can affect grief and healing? Check all that apply. The repeated-measures design, skipping the baseline test: The graduate student could use a repeated-measures design as he did originally, but have the study participants skip the baseline test and use only the results of the test after the 2 months of journaling The matched-subjects design: The graduate student could use the baseline scores to match each person to another with a similar score. Then he could randomly assign one person in each pair to journal for 2 months and the other person to serve as a control. Everyone would still complete two batteries of psychological questionnaires, 2 months apart, but only those not assigned as controls would journal for 2 months. He could then use a repeated-measures t test comparing the difference in the final scores between the member of the pair who journaled for 2 months and the member who did not. The independent-measures design with assignment by baseline scores to the control and treatment groups: The graduate student could assign those with the lowest baseline scores to journal for 2 months and have the rest serve as a control group. Both groups would still complete two batteries of psychological questionnaires, 2 months apart, but only those not in the control group would journal for 2 months. He could then use the independent-measures t test to compare the scores from the two groups. The independent-measures design with random assignment to the control and treatment groups: The graduate student could randomly assign half of his sample to journal for 2 months and half to serve as a control group. He could use an independent-measures t test to compare scores from the battery of psychological questionnaires administered to both groups after the treatment group journaled for 2 months.

Explanation / Answer

The matched subject design is better design forinvestigating whether journaling can affect grief and healing. Because in these design take pair of widowers or persons who have same property or similer score, for these use a Baseline score. and then randomely assign to one person in each pair to journal for 2 months and other person to serve as a control. Then 2 months apart , he could use a repeated measures t-test comparing the difference in the final scores between the member of the pair who journaled for 2 months and the member who did not.

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