A newspaper reporter wants to know whether houses are bigger on the east side of Wichita than on the west side of Wichita.

A newspaper reporter wants to know whether houses are bigger on the east side of Wichita than on the west side of Wichita. She collects a sample of 100 houses on the east side, and a matched sample of 100 houses on the west side that have the same characteristics as the east side houses. Which statistical tool should she use to analyze her data?