Which statement is a null hypothesis for a study comparing two methods of preventing intravenous catheter infection?
Correct answer: C. There is no difference in infection rates between the two methods.
- A. The new method prevents more infections than the usual method.
- B. The usual method is less effective than the new method.
- C. There is no difference in infection rates between the two methods.
- D. Patients using the new method will have fewer infections.
Explanation
A null hypothesis states that no difference or relationship exists between the groups or variables. The other statements predict a difference and are examples of directional research hypotheses.
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