2X2X2 Factorial Design Example
Question: • Know the difference between a one way design versus factorial design
Answer: hint. # of IVs is the answer! It has nothing to do with levels/conditions) one is only looking at 1 IV its doesn’t matter the levels or condition while factorial design has more than one variable
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Question: • How do we conduct a factorial design study? (Basically, how do we run a two way design study? You manipulate two variables).
Answer: make a chart
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Question: • Be able to identify type of design given the factorial abbreviations (e.g., 2x2, 2x3x2).
Answer: Variable 1: Price Cheap versus Expensive
Variable 2: Type of Bottle Glass versus Plastic 2 Way: two Independent Variables
◦ 2x2, 4x2, 3x2, 4x4
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Question: • How many IVs does each factorial design have? And how many levels to each of the IVs have?
2x2x2 Factorial Design Example - Spinal Treatment
1. Manipulation
2. Massage
Heat Therapy
1. Yes
2. No
Electric Stimulation
1. Yes
2. No
Answer: 2x2=4
2x3x2=12
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Question: when I ask you how many “conditions” or “levels” in a study I am referring to how many levels of the IV are there (how many conditions in our diet example of south beach, weight watchers, and atkins?
Answer: 2 of each
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Question: Condition combinations” applies to factorial designs when you actually have to calculate how many total conditions they can be in
Answer: The answer is 3).
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Question: 2-way versus 3-way etc. design is given scenarios
Answer: (think spinal manipulation, heat, and shock example…multiply).
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Question: Dr. T is interested in studying how environmental factors influence memory. He wants to manipulate the following variables: temperature of the room, the lighting, and stress level. He decides that the temperature of the room will be either hot or cold. The lighting will be dark or bright. The stress level will be low stress, high stress, and neutral stress. What is the appropriate design of this study?
a)3x2 Factorial Design
b)2x2x3 Factorial Design
c)2x2x2 Factorial Design
d)2x2x2x2 Factorial Design
Answer: (hint. Focus on how many IVs are being manipulated
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Question: How many independent variables are in the following factorial design: 3x2x2x4
a)1
b)2
d)3
e)4
Answer: Correct Answer is B
3 IVs, and two IVs have 2 levels and the other has 3
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