Thanks again Vinux,

Sorry about my CI question, with my limited knowledge of stats I'm not sure how to re-word the question. Here is the question:

The distribution of diastolic blood pressures for the population of women with diabetes

between the ages of 30 and 34 has an unknown mean μ and standard deviation of σ =

9.2 mm Hg. It may be useful to physicians to know whether the mean of this population

is equal to the mean diastolic blood pressure of the general population of females in this

age group, 76.4 mm Hg.

a) What are the null and alternative hypotheses of the appropriate test? **Completed**

b) A sample of 25 women aged 30 to 34 years with diabetes is selected; their mean

diastolic blood pressure is 85 mm Hg. Using the information given conduct a two-sided

test at the α= 0.05 level of significance. **Completed above**

c) What is the 95% confidence interval for this point estimate and p-value of the test? **I have the p-value but am unsure how to calculate the CI**