Below, the essence of `POSSA`'s power (and type 1 error rate, T1ER) calculation for sequential designs is explained using the simple example of a t-test. Of course, for t-tests specifically, you could use other and potentially more user-friendly software – however, the point here is to understand how the `POSSA` works, and, subsequently, it should be possible for you to extend this example to virtually any statistical null hypothesis test. Cases of multiple hypotheses (and recording descriptives) are explained on a [separate page](https://gasparl.github.io/possa/vignettes/v_2_multiple_hypotheses.html), but these too are straightforward extensions of the present examples.
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