(Answered) Select the study that is most appropriate and explain why

Statistics

Select the study that is most appropriate and EXPLAIN WHY it is most appropriate for the study.

Is the aspirin produced by a particular pharmaceutical company better than that of a competitor at relieving headaches? Which of the following would best be used to study this:

1) a case-controlled observation;

2) an observation;

3) a double-blind experimental procedure; and

4) and experimental procedure.

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