You can have several different ones, depending on what you think the outcome will be!
- if you think shots are more effective:
Participants who are given the flu vaccine will have less flu cases than the participants who are given the nasal spray.
-if you think the nasal spray is more effective:
Participants who are given the nasal spray will have less flu cases than the participants who are given the nasal spray.
if you think both are equally effective:
you actually can't do this one- as you don't have a "control" meaning participants who received neither the nasal spray nor the shot, for all we know, vaccinated people also didn't catch the flu!
If you think both are equally ineffective:
Participants who were given the flu vaccine and the participants who were given the nasal spray will still catch the flu.
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