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A cognitive psychologist wants to know if playing background music improves students' reading comprehension. They plan to have one group read in silence and another read with music playing, then compare their subsequent quiz scores. Briefly explain why an observational research design cannot be used to execute this specific study plan.

Question: A cognitive psychologist wants to know if playing background music improves students' reading comprehension. They plan to have one group read in silence and another read with music playing, then compare their subsequent quiz scores. Briefly explain why an observational research design cannot be used to execute this specific study plan.

Sample answer: This study plan requires manipulating a variable (the presence or absence of music) to create different conditions. Observational research requires examining subjects without any manipulation or control of variables, making it incompatible with a design that introduces an intervention.

Key points:

  • The planned study involves manipulating a variable (the presence of music).
  • Observational research explicitly prohibits the manipulation or control of variables.

Feedback: Observational research strictly forbids the manipulation of variables. Because the researcher wants to introduce a specific condition (background music) to one group and not the other, they are manipulating a variable, which violates the fundamental definition of observational research.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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