Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 11

Archaeology: Pottery Three-circle, red-on-white is one distinctive pattern painted on ceramic vessels of the Anasazi period found at the Wind Mountain archaeological site (see source for Problem 7). At one excavation, a sample of 167 potsherds indicated that 68 were of the three-circle, red-on-white pattern.
(a) Find a point estimate
for the proportion of all ceramic potsherds at this site that are of the three-circle, red-on-white pattern.
(b) Compute a 95% confidence interval for the population proportion p of all ceramic potsherds with this distinctive pattern found at this site.