Could someone please tell me some or any of the formulas for working with alternative and null hypothesis? Or how to go about finding the answer. I missed a day and I don't understand my professor very well.

Here is some stuff I need to know.

- How to construct a confidence interval for $\displaystyle \mu$
- Find the width of the confidence interval
- Determine the margin of error
- Specify the critical region
- Find the P-value
- How to find $\displaystyle \mu$o if you know that

- Ho: $\displaystyle \mu$ =170 cm
- Ha: $\displaystyle \mu$ $\displaystyle \neq$ 170 cm
- $\displaystyle \alpha$ = .05
- $\displaystyle \sigma$ = 12
- $\displaystyle \bar{x}$ = 174.1
- n = 30

Sorry if this is asking too much, it is really stressing and I'm not sure what else to do. Anything would be appreciated, even a website would help. Thanks