n Question $2\mathrm{.}1$ you performed $20$ interim analyses of simulated data for an A$/$A design. Modify the code of Question $2\mathrm{.}5$ to implement a sequential analyses using Pocock's boundary to control the type I error in $100$ experiments.

Then compare the estimated type I error rate when the Pocock's method is used with the expected type I error rate value.

Assign your answer to an object called answer$3\mathrm{.}2\mathrm{.}3.$ Your answer should be a tibble with two columns: n$\_$rejections$\_$Pocock and expected$\_$n$\_$rejections.