Answer
This is an Observational Study, because the subjects decide their own treatment.
Response Variable = Die (Yes/No)
Explanatory Variable = Alcohol consumption
Work Step by Step
As given above
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 11 - Producing Data: Part II Review - Supplementary Exercises - Page 273: 11.25a
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