Which action represents the nurse researcher's attempt at constancy in data collection to control extraneous variables in a study examining the effect of hormone replacement therapy on bone-density loss in postmenopausal women?
A) Drawing the blood at the same time of day for all subjects
B) Having the same phlebotomist drawing the blood from all subjects
C) Using the same room for drawing blood from all subjects
D) Ensuring that all subjects were postmenopausal women taking hormone replacement therapy

Question

Quizplus · Accepted Answer

Correct A: Constancy in data collection,for example,identical timing of data collection,helps maintain control in the research design.
Incorrect B: In this scenario,the same person drawing blood samples would not maintain constancy on effects of hormone therapy.
Incorrect C: The same environment for blood draws would not maintain constancy on effects of hormone therapy.
Incorrect D: If subjects were already receiving hormone therapy,it would be difficult to distinguish the effects of the new treatment.

Which Action Represents the Nurse Researcher's Attempt at Constancy in Data