Which of the Following Techniques or Actions Represents Constancy in Data

question 14

Multiple Choice

Which of the following techniques or actions represents constancy in data collection for control of extraneous variables in a study examining the effect of hormone replacement therapy on bone density loss in postmenopausal women?

• A) Drawing blood from all subjects at the same time of day
• B) Always having the same nurse or phlebotomist always draw blood from all subjects
• C) Using the same room for drawing blood from all subjects
• D) Ensuring that all subjects are postmenopausal women taking hormone replacement therapy

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Definitions:

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The point of intensity at which a stimulus becomes detectable to an individual or evokes a response.

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A low-frequency tone or sounds, often associated with music, or refers to certain types of fish found in fresh and salt water.

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A person who excels in a specific field or activity, often serving as a defender or promoter of a cause.