An inventor has developed a new spray coating that is designed to improve the wear of bicycle tires. To test the new coating, the inventor randomly selects one of the two tires on each of 50 bicycles to be coated with the new spray. The bicycle is then driven for 100 miles and the amount of the depth of the tread left on the two bicycle tires is measured (in millimeters) (i.e. each bicycle will provide two measurements).What test would be appropriate to test the research hypothesis that thenew spray coating improves the average wear of the bicycle tires