Calculate the margin of error and construct a confidence interval for the population proportion using the normal approximation to thepp-distribution (if it is appropriate to do so).

Standard Normal Distribution Table

a.p=0.7,n=160,=0.05

E=

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

< p <

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

b.p=0.45,n=140,=0.02

E=

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

< p <

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used