The nurse researcher is using respiratory rate as a variable in a research study. The level of measurement most appropriate in this case is what?
a. Nominal
b. Ordinal
c. Interval
d. Ratio
ANS: D
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A Rate is represented by a number representing frequency per minute.
B Rate is represented by a number representing frequency per minute.
C Rate is represented by a number representing frequency per minute.
D Respiratory rate can have an absolute zero—absence of respirations.
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