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Case Study

Explain how the lengths of the xx-axis and yy-axis should be configured for this scatterplot, and describe why this configuration is beneficial for a viewer trying to comprehend the relationship between the two measurements.

Case context: A researcher is conducting a study on developmental changes and measures children's self-esteem on a scale from 11 to 1010 at the start of the year (Time 1) and at the end of the year (Time 2). To display this data, the researcher decides to construct a scatterplot with Time 1 on the xx-axis and Time 2 on the yy-axis.

Question: Explain how the lengths of the xx-axis and yy-axis should be configured for this scatterplot, and describe why this configuration is beneficial for a viewer trying to comprehend the relationship between the two measurements.

Sample answer: The researcher should make both the xx-axis and the yy-axis of equal length. Since the two variables (Time 1 and Time 2 self-esteem) are conceptually similar and utilize the same 11 to 1010 measurement scale, ensuring equal axis length visually emphasizes the relationship between the two time points, allowing the viewer to easily comprehend and compare the data.

Key points:

  • Make both the xx-axis and yy-axis of equal length.
  • Recognize that Time 1 and Time 2 self-esteem are conceptually similar and use the same scale.
  • Explain that equal axis length visually emphasizes the relationship between the two variables.

Rubric: The response must state that the axes should be equal in length and explain that this visually highlights the relationship because the measurements are conceptually similar and share the same scale.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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