I read this from the course < Master Statistics with Python Skill Path>:

- In practice, the alternative hypothesis and significance threshold should be chosen prior to data collection.

Does anyone know why is the order important?

Thanks in advance!

I read this from the course < Master Statistics with Python Skill Path>:

- In practice, the alternative hypothesis and significance threshold should be chosen prior to data collection.

Does anyone know why is the order important?

Thanks in advance!

The idea is to have an â€śobjectiveâ€ť condition to use to evaluate your hypothesis.

So you choose the significance level before doing testing a hypothesis.

If youâ€™d collect the data first,

there may be a temptation to choose the significance level

to make the hypothesis test turn out to be the result that you prefer;

which would not be an objective result.

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Thank you very much for the clear explanation!