I'm sort of confused with this statistics problem:

As part of a recent study conducted in France investigating the effectiveness of the drug mifepristone for terminating early pregnancy, 488 women were administered mifepristone followed 48 hours later by a single dose of a second drug, misoprostol. In 473 of these women, the pregnancy was terminated and the conceptus completely expelled.

a. Estimate the proportion of successfully terminated early pregnancies among women using the described treatment regimen.

**473/488= .97 or 97%**is this correct ???

b. Construct a 95% confidence interval for the true population proportion p.

We haven't covered this sort of problem in our class yet and I was wondering if someone could me along.

Thank You