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You have an idea that something happened - Your guess or hypothesis about what happened might be:
- Groups are different from each other.
- Some treatment has an effect on an outcome measure.
- One variable predicts another variable.
There are two possibilities:
1. Nothing happened - We call this the Null Hypothesis - H0
2. Something happened - We call this the Alternative Hypothesis - H1
That's it! When you test a statistical hypothesis, you are trying to see if something happened and are comparing against the possibility that nothing happened.
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