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Melanie and Lance gathered data about the effectiveness of masks preventing disease. One of the questions they ask the experimental subjects is their age. What type of observation is this? *
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Melanie and Lance gathered data about the effectiveness of masks

preventing disease. One of the questions they ask the experimental
subjects is their age. What type of observation is this? *

User Anis KCHAOU
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When she gathers the effectiveness of mask prevention the disease of mask that is when she has to experiment on whether it’s effective or not! Hope this helps!
User Ahmedshahriar
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