Assume that the population distributions of ages (in years) of students at two different universities in Ontario are normal with equal variances. Two random samples, drawn independently from the populations, showed the following statistics: 
= 10, 
= 25, 
= 4; 
= 9, 
= 24, and 
= 9. Construct and interpret a 99% confidence interval for the true difference in average ages of students at each university.
Definitions:
Port Facilities
Infrastructure and services provided at a port to support the loading, unloading, maintenance, and storage of ships and their cargoes.
Absolute Advantage
The ability of a country, company, or individual to produce a good or service more efficiently than competitors, using fewer resources.
Monopoly
Market situation in which a single seller dominates trade in a good or service for which buyers can find no close substitutes.
Less-developed Countries
Nations with a lower standard of living, underdeveloped industrial base, and low Human Development Index (HDI) relative to other countries.
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