Answer
It is a prospective study.
Work Step by Step
The study of nurses started many years ago, but it is still going on and has been tracking the same people for a long time, therefore it is a prospective study.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Beyond the Basics - Page 34: 27
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