Researchers at the U.S. National Institute of Aging in Bethesda, Maryland, have been studying hearing loss. They have hypothesized that as men age they will lose their hearing faster than comparably aged women because many more men than women have worked at jobs where noise levels have been excessive. To test their beliefs, the researchers randomly selected one man and one woman aged 45, 46, 47, . . . , 78, 79, 80 and measured the percentage hearing loss for each person. What conclusions can be drawn from these data?