I don't get it
Population:
Women - 800
Men - 1,000

Avg retirement Age:
Women - 62.7
Men - 62.2

Standard Deviaition
Women - 4.5 yrs.
Men - 3 yrs.

Question: Find a 99% confidence interval for the differenct between the corresponding population means.

Test at the 2.5 significance level whether the mean retirement age for all women is higher than the retirement age for all men.