Solved: In Exercises 2730, indicate whether the observational study used is
Chapter 1, Problem 27(choose chapter or problem)
In Exercises 2730, indicate whether the observational study used is crosssectional, retrospective, or prospective.Nurses Health Study The Nurses Health Study was started in 1976 with 121,700 female registered nurses who were between the ages of 30 and55. The subjects were surveyed in 1976 and every two years thereafter. The study is ongoing.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer