Charlotte is studying subliminal messages and weight loss. She is curious whether people will lose more weight if they hear subliminal messages that encourage weight loss ("don't eat that food," "you want to be thin," etc.) in the music on their iPods than will people who do not have subliminal messages in their music. She studies 40 people and finds the following results:
Although Charlotte is concerned with exposure to subliminal messages, she collects data from people not exposed to subliminal messages. What is this group called? Why must this group be included in her study?
Definitions:
Capillary Refill Time
The time taken for color to return to an external capillary bed after pressure is applied, indicating the circulatory status.
Palpating
The act of examining part of the body by touch, especially for medical purposes.
Blanching
The process of whitening or pale appearance when pressure is applied to the skin, indicating reduced blood flow or perfusion.
Nerve Cord
A bundle of nerves that extends from a central ganglion or brain and gives rise to smaller nerves. In vertebrates the nerve cord is dorsal and tubular.
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