Ok, I was thinking about it and got these answers:
1 ) B.J performed an upper–tail test while Mike performed a lower-tail test.
It wouldn't matter if it was an upper or lower one right? They'd still have
to have the same probabilities.
2) With probability 0.99, the interval (2,5) contains the true difference uB-uA
I know this confidence level means that they are 99% confident that the
mean difference is from 2 to 5. Does this correspond to the "probability"
Those are my "educated" guesses at best. Can someone explain/correct me?