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Possible outcomes of a frequentist, 2-sided hypothesis testing exercise
| Unobserved reality in the population (“Truth”) | Result of test based on observed data | |
|---|---|---|
| Do not reject H0 | Reject H0 | |
| The 2 treatments are equivalent H0 is true | Correct | Type I error |
| The 2 treatments are different HA is true | Type II error | Correct |
