Consider the following scenarios. I. A group of musicians count how many times they can snap their fingers in 10 seconds with their dominant hands and with their nondominant hands. They will test to...

Consider the following scenarios.

I.  A group of musicians count how many times they can snap their fingers in 10 seconds with their dominant hands and with their nondominant hands. They will test to see if musicians can snap faster with dominant hands than with nondominant hands.

II.  A group of musicians is trying to measure the effectiveness of practice time. Half of them practice a difficult piece of music for one hour each day while the other half practice two hours each day.  After a week, each musician plays the piece as a judge counts the number of errors. They will test to see if more practice results in fewer errors.

Which are the proper choices for the hypothesis tests?