Based on the properties of the variables measured in Dr. Aris's study, justify how she should design the physical lengths of the scatterplot's -axis and -axis, explaining how this visual design choice relates to the nature of the variables.
Case context: Dr. Aris is conducting a study on cognitive fatigue. She measures participants' working memory capacity using a computerized span task at 9:00 AM (pre-test) and again at 5:00 PM (post-test). She plans to represent the relationship between these two working memory measurements using a scatterplot with the pre-test scores on the -axis and the post-test scores on the -axis.
Question: Based on the properties of the variables measured in Dr. Aris's study, justify how she should design the physical lengths of the scatterplot's -axis and -axis, explaining how this visual design choice relates to the nature of the variables.
Sample answer: Dr. Aris should draw both the -axis and the -axis to be the exact same physical length. This visual choice is justified because the pre-test and post-test working memory scores are conceptually similar variables (the same construct measured on different occasions) measured on the exact same scale. Drawing both axes to the exact same physical length visually emphasizes this conceptual similarity and identical scaling.
Key points:
- Dr. Aris should draw both axes to be the exact same physical length.
- Pre-test and post-test measures are conceptually similar (working memory capacity).
- Both measurements are taken using the exact same scale.
- Equal physical lengths visually emphasize the conceptual and scaling similarity.
Rubric: To receive full credit, the student must: 1) Propose that both the -axis and the -axis should be drawn to the exact same physical length. 2) Explain that this formatting choice is justified because the two variables are conceptually similar and measured on the exact same scale. 3) State that this design choice emphasizes the similarity between the variables.
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Research Methods in Psychology - 4th American Edition @ KPU
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