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Which effect is probably most problematic

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Madison is testing the level of heart rate of a group of middle school students after they went through a haunted house in a theme park. Specifically, she wants to know if bringing a flashlight reduces anxiety (heart rate). The students first walk through the haunted house without a flashlight. Their heart rate is measured. Then walk through the haunted house and bring a flashlight. Then their heart rate is measured. Which effect is probably most problematic?

Reference no: EM132847635

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