Documented evidence (data) gathered through direct observation rather than a researcher's subjective belief is :

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E6 NursingResearch Polit 11e Part 1 pp. 24-26, 60-62
E6 Nursing Fundamentals Taylor p. 428-430
Practise the full RUHS, Jaipur, M.Sc Nursing Entrance Exam-2023
Attempt every question from this paper in a timed mock, then review the full solution for each one.