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When is the ordinal level of measurement the correct level of measurement to use?
SA Node
Sinoatrial Node; the heart’s natural pacemaker, responsible for initiating the electrical impulses that determine the heart rate.
Pulse Oximetry
A non-invasive method to measure the oxygen saturation level of the blood using a device attached usually to a fingertip.
Sleep Apnea
A condition characterized by pauses in breathing during sleep.
Ultrasound
A technique that uses high-frequency sound waves to create images of the inside of the body.
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