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Unsung People 2 questions

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Questions in this quiz (2)

1Researchers wanted to identify if receiving a positive message from an immediate family member (parent / sibling / child) lead to generous behavior. Data was collected on 200 UVA students, who were randomly assigned to a treatment or control group. In the treatment group, the 100 participants received a positive message from an immediate family member before they were given a form in which they could choose to volunteer for a non-profit. In the control group, the 100 participants did not receive any message before they were given the same form. 57% of all treatment group participants signed up to volunteer for the non-profit, whereas 45% of control group participants chose to volunteer. Is this an experiment or an observational study?
1. AExperiment
2. BObservational study
2What makes it so (experiment / observational study)?
1. Aabc
2. Basdffg