Why must this group be included in her study

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Question: Marianne 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") 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:

Number Who Lost Weight	Number Who Did Not Lose Weight
Exposed to Subliminal Messages	(Cell A) 15 people	(Cell C) 5 people
Not Exposed to Subliminal Messages	(Cell B) 10 people	(Cell D) 10 people

Although Marianne 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?

Reference no: EM133598929

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