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You can spend $5 for lunch and you would like to have two double cheeseburgers. When you get to the restaurant, you find out the price for double cheeseburger has increased from $2.50 to $2.99. You decide to have just one double cheeseburger for lunch. This is best described as a(n) :
Internal Validity
The extent to which a study can demonstrate a cause-and-effect relationship between variables, without influence from external factors.
External Validity
The degree to which the outcomes of research can be applied to different contexts and populations beyond the experimental environment.
Reversal Design
A single-subject experimental design in which behavior is measured to provide a baseline (A), then again after the treatment has been applied (B), then again after the conditions during baseline have been reintroduced (A), and then once again after the treatment is reintroduced (B). Also known as ABAB design.
Single-Subject Experiments
Research studies that focus on the response of a single subject to experimental treatments over time, allowing detailed observation of behavior changes.
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