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Dr. Bloedorn is a health psychologist who researches nutrition. She is curious as to whether a new drink additive will help people consume fewer calories during a meal. The drink additive is a white, odorless, tasteless powder that a person can add to any drink. She collects a random sample of 63 overweight students on campus and measures the calories they eat during lunch using a bomb calorimeter. She then gives this additive to the same 63 participants to use at dinner and measures how many calories they eat (again using the bomb calorimeter) .
The addition of a group that does not use the drink additive but adds a similar-looking substance that they think is the additive would help Dr. Bloedorn address which of the following threats to internal validity?
Perfectly Inelastic
describes a situation where the demand for a product does not change in response to changes in its price.
Unitary
Describes a system of government where there is no division of powers between regional governments and a central government, or a singular entity in a given context.
Elasticity of Supply
A measure of how the quantity supplied of a good responds to a change in the price of that good, defined as the percentage change in quantity supplied divided by the percentage change in price.
Total Revenue
The total income generated from the sale of goods or services before any expenses are subtracted.
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