The nurse has defined the hypothesis as, "There will be no difference in the number of adverse events among patients discharged two days after an abdominal hysterectomy compared with patients discharged 4 days after an abdominal hysterectomy."
This statement is an example of what?
a. Directional hypothesis
b. Nondirectional hypothesis
c. Research hypothesis
d. Null hypothesis
ANS: D
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A Because no direction is indicated, this is not a directional hypothesis.
B A nondirectional hypothesis indicates the existence of a relationship between variables but does not indicate the direction. This hypothesis indicates no relationship between variables.
C A research (or scientific) hypothesis is a statement of the expected relationship of the variables. This hypothesis indicates no relationship between variables.
D This is a null (or statistical) hypothesis, stating that there is no relationship between the independent (postoperative days) and dependent (adverse events) variables. If in the statistical analysis a significant relationship is found, the null hypothesis would be rejected.
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