I need help figuring out if these problems use one sided, two sided, regression or confidence interval. I know how to do the test I just don't know how to recognize which test to perform.

1.It is believed that high school students who do not exercise have a heart rate (at rest) above 70. Given the data your job is to confirm or disprove this belief.

2.Is it reasonable to claim that students who exercise more have a lower heart rate at rest? Given the data your job is to confirm or disprove this claim.

3.Is it reasonable to claim that students who do not exercise or exercise less than 10 hours a week have a higher average heart rate at rest than those who exercise 10 hours or more a week? Given the data your job is to confirm or disprove this claim.