Case Study

Based on the provided text's definition of experimental and non-experimental designs, explain how each independent variable in this study (background music tempo and personality type) is handled, and determine whether this study can be classified as a true experiment.

Case context: A research group is investigating the effects of background music tempo (fast vs. slow) and participant personality type (introvert vs. extravert) on reading comprehension. They randomly assign participants to either the fast or slow music tempo condition, and they use a personality questionnaire to determine whether each participant is an introvert or an extravert.

Question: Based on the provided text's definition of experimental and non-experimental designs, explain how each independent variable in this study (background music tempo and personality type) is handled, and determine whether this study can be classified as a true experiment.

Sample answer: In this study, background music tempo is an actively manipulated independent variable because participants are randomly assigned to fast or slow conditions. Personality type is a measured (non-experimental) independent variable because it is a pre-existing characteristic of the participants. Because not all independent variables are actively manipulated, this design cannot be classified as a true experiment overall; instead, it is a mixed factorial design containing a non-experimental variable.

Key points:

  • Identify music tempo as manipulated / experimental.
  • Identify personality type as measured / non-experimental.
  • Explain that true experiments require active manipulation of independent variables.

Rubric: The answer should identify music tempo as manipulated (experimental) and personality type as measured (non-experimental). It should explain that a true experiment requires active manipulation of the independent variables, and therefore this design is not classified as a true experiment overall.

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Updated 2026-05-26

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Research Methods in Psychology - 4th American Edition @ KPU

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