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An experiment was done by randomly assigning each participant either to walk for half an hour three times a week, to sit quietly reading a book for half an hour three times a week, or to not change behavior at all (control).Â At various points over the next year the participants’ blood pressureÂ was measured, and the results were compared for the three groups. This is a randomized experiment rather than an observational study because: Â Â

Â A. Participants were randomly assigned to either the reading group,Â activity group or the control group
Â B. The three groups were compared at the end of the study.
Â C. A random sample of participants was used
Â D. The dependent variable -Â blood pressure – was checked randomly throughout the year.Â
SCIENCE
HEALTH SCIENCE
NURSING
NURS 607

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