The p-Value

There are a few reasons someone would determine the value of a p-value:

  • The p-value is an alternate method for deciding whether or not to reject Ho (as opposed to using a rejection region)
  • The p-value tells you the exact probability of selecting a sample as rare as the one you have - given that the Ho is true (the rejection region does not do this)
  • It will get you the mark you need when asked to 'calculate the p-value' 🙂

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