3.10.C—Calculate an appropriate confidence interval for the difference between two population proportions

Calculate an appropriate confidence interval for the difference between two population proportions.

• The point estimate for the difference between two population proportions is pp 12 .
• For the difference between two population proportions, the interval estimate can be constructed as point estimate (margin of error). The interval estimate for the difference between two population proportions is  ( )     112 12 2 12 1 1p pp p pp z nn .