An insurance company collects data on seat-belt use among drivers in a country. Of 1700 drivers 30-39 years old, 20%

said that they buckle up, whereas 440 of 1800 drivers 55-64 years old said that they did. Find a 98% confidence interval for the difference between the proportions of seat-belt users for drivers in the age groups 30-39 years and

55-64 years.

Construct a 98% confidence interval.

The 98% confidence interval for p1p2 is from ................ to ..................