Restriction in the study that may decrease the credibility the research findings?

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E6 NursingResearch Sukhpal Kaur pp. 119-121, 117-119
E6 NursingResearch Suresh Sharma 5e Part 1 p. 106-108
Practise the full RUHS, Jaipur, M.Sc Nursing Entrance Exam-2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.