How would I work on this question step by step?

The National Health Statistics Reports dated Oct. 22, 2008, included the following information on the heights (in.) for non-Hispanic females:

AGE	Sample Size	Sample Mean	Std. Error of Mean
20-39	886	64.9	.09
60 and Older	934	63.1	.11

a) How do I calculate and interpret a confidence level at 95% to determine the difference between the population mean of height for younger women and that for older women?

- Denote the population mean height for those aged 20-39 and indicate the population mean height for those aged 60 and older. Interpret the hypotheses and then test these hypotheses at significance level .001 using the rejection region approach.

b) What is the P-value for the test you carried out in (b)? Would you reject the null hypothesis at any reasonable significance level based on this P-value? Explain.

c) What hypotheses would be appropriate if

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