This is personal study note
Copyright and original reference:
https://www.youtube.com/watch?v=uzsNpYSiXjY&list=PLsri7w6p16vtEz_J1G7HQG-Rm8vpZPtPS&index=2
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test based on "mean"
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Establish hypothesis
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Create p-value
$$$\alpha$$$: probability of wrong
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Left side test and Right side test
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Example
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left sided test