Exercise 9.6.1

[GustavoMeza]

It looks to me like you are picking a random lsat and a random gpa and making them a pair for the bootstrap.
I think we want to pick a random pair directly instead.

e.g.
lsat = [1,2]
gpa = [3,4]

We want to pick randomly from (1,3) and (2,4).
So (1,4) would be impossible.