Those are nice problems. Perhaps you could demonstrate SOME understanding of the solutions.
Can you define a Null Hypothesis?
Can you differentiate between 1-tail and 2-tail tests?
Do you know when to use a t-statistic vs. a z-statistic?
What is the role of a "Critical Value"?
What is a "Rejection Region" and how does it work?
Help us out, here. I'm guessing you already have a textbook and a teacher. Will it REALLY help if we repeat what you know already? For this reason, please demonstrate what you know already.