1) Find the confidence interval for estimating the population proportion for parts (a) through (c).

a. 92.5% confidence level; n=600; p=0.20

b. 95% confidence level; n=160; p=0.02

c. =0.09; n=365; p=0.90

a. The confidence interval is_____

(Round to four decimal places as needed.)

b. The confidence interval is ____

(Round to four decimal places as needed.)

c. The confidence interval is ____

(Round to four decimal places as needed.)

2) Suppose that a random sample of 120 graduate-admissions personnel was asked what role scores on standardized tests play in consideration of a candidate for graduate school. Of these sample members,

66 answered "very important." Find a 95% confidence interval for the population proportion of graduate admissions personnel with this view.

a) The 95% confidence interval is from _____ to ____

(Round to four decimal places as needed.)