An insurance company collects data on seat-belt use among drivers in a country. Of

1500

drivers

30-39

years old,

20%

said that they buckle up, whereas

417

of

1600

drivers

55-64

years old said that they did. Find a

99%

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

99%

confidence interval.