Does helium help a football fly longer? If so, home teams may be able to gain a competetive advantage by switching footballs for punts and kick-offs.

Two identical footballs, one air-filled and one helium-filled, were used outdoors on a windless day at The Ohio State University's athletic complex. The kicker was a novice punter and was not informed which football contained the helium. Each football was kicked 39 times. The kicker changed footballs after each kick so that his leg would play no favorites if he tired or improved with practice.
 

Note: In the data set, Column 1 gives the distance in yards of the air-filled football, and Column 2 gives tdistance in yards of the helium filled football.

Reference: Lafferty, M. B. (1993), "OSU scientists get a kick out of sports controversy", "The Columbus Dispatch,"