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Based on this scenario, explain how the researcher must combine these factors to structure the study as a factorial design. Identify the specific factors, their levels, and list all the resulting distinct conditions that must be created.
Case context: A health psychologist is planning a study to test calorie estimation. They decide to use a factorial design to test the effects of two factors: participant major (psychology vs. nutrition) and food type (cookie vs. hamburger).
Question: Based on this scenario, explain how the researcher must combine these factors to structure the study as a factorial design. Identify the specific factors, their levels, and list all the resulting distinct conditions that must be created.
Sample answer: To structure this as a factorial design, the researcher must combine every level of the first factor (participant major) with every level of the second factor (food type). The factors and their levels are participant major (psychology and nutrition) and food type (cookie and hamburger). This systematic combination creates four distinct conditions: psychology major with cookie, psychology major with hamburger, nutrition major with cookie, and nutrition major with hamburger.
Key points:
- The factors and levels are participant major (psychology vs. nutrition) and food type (cookie vs. hamburger).
- A factorial design combines every level of one factor with every level of the other factor.
- There are four resulting experimental conditions: psychology/cookie, psychology/hamburger, nutrition/cookie, and nutrition/hamburger.
Rubric: The response should be graded based on: 1) Correctly identifying the two factors and their levels (participant major: psychology/nutrition; food type: cookie/hamburger). 2) Explaining that factorial designs require combining every level of one factor with every level of all other factors. 3) Accurately listing the four resulting distinct conditions.
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Research Methods in Psychology - 4th American Edition @ KPU
Related
Factorial Design Notation
Main Effect
Example of a Factorial Design Table
Between-Subjects Factorial Design
Within-Subjects Factorial Design
Mixed Factorial Design
Non-Experimental Factorial Design
Graphing Factorial Experiments
Factorial ANOVA
Example of a Non-Manipulated Independent Variable: Private Body Consciousness
Interaction Effect
Example of a Factorial Design
Example of a Factorial Design
What is the defining characteristic of a factorial design?
In a factorial design, researchers evaluate multiple independent variables by testing each one in separate, isolated conditions rather than combining them.
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In a factorial design, every level of one independent variable is systematically combined with every level of the other independent variables, such that each unique combination of these levels forms a distinct _____ within the experiment.
In a study investigating the effects of participant major (psychology vs. nutrition) and food type (cookie vs. hamburger) using a factorial design, a researcher must structure the study with exactly distinct conditions because the design requires combining every level of the major factor with every level of the food type factor.
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Define a factorial design as it is used in experimental research. In your definition, explain how independent variables (factors) and their levels are structured to form the conditions of the experiment.
Based on this scenario, explain how the researcher must combine these factors to structure the study as a factorial design. Identify the specific factors, their levels, and list all the resulting distinct conditions that must be created.
A cognitive psychologist is designing a memory experiment with two independent variables: Study Environment (Quiet vs. Noisy) and Study Method (Spacing vs. Cramming). Applying the principle of a factorial design, how many distinct experimental conditions must they create, and what are these conditions?