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Observational Studies versus Experiments
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ACT Prep
ACTM.219 Observational Studies versus Experiments
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A nonprofit randomly mails one of three donation-letter versions to households on its list and compares response rates. What is the study type and conclusion?
A
An observational study because households decide whether to donate.
B
A survey because the outcome is a response rate.
C
A randomized field experiment; it can support a cause-and-effect conclusion about letter version and response rate for households on the list.
D
An observational study because three groups cannot be randomly assigned.
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