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Dr Bloedorn Is a Health Psychologist Who Researches Nutrition

question 32

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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?

Assess factors influencing the feasibility of home care for ventilator-dependent children.
Recognize and support emotional challenges faced by parents of children with complex health care needs.
Describe post-operative care and expectations for children undergoing eye surgery for retinoblastoma.
Determine appropriate post-operative positioning for children after a supratentorial craniotomy.

Definitions:

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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