Male Displays. Black wheatears, Oenanthe leucura, are small birds of Spain and Morocco. Males of the species demonstrate an exaggerated sexual display by carrying many heavy stones to nesting cavities. This 35-gram bird transports, on average, 3.1 kg of stones per nesting season! Different males carry somewhat different sized stones, prompting a study of whether larger stones may be a signal of higher health status. M. Soler et al. (“Weight Lifting and Health Status in the Black Wheatear,” Behavioral Ecology 10(3) (1999): 281–86) calculated the average stone mass (g) carried by each of 21 male black wheatears, along with T-cell response measurements reflecting their immune systems’ strengths. The data in Display 7.19 were taken from their Figure 1. Analyze the data and write a statistical report summarizing the evidence supporting whether health—as measured by T-cell response—is associated with stone mass, and quantifying the association.