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

Standard Normal Distribution Table

a. p=0.9,n=180,=0.05p=0.9,n=180,=0.05

E=E=

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

b. p=0.4,n=120,=0.05p=0.4,n=120,=0.05

E=E=

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used

Round to four decimal places if necessary

Enter 0 if normal approximation cannot be used