In a study of techniques used to measure lung volumes, physiological data were collected for 10 subjects. The values given in the accompanying table are in liters, representing the measured forced vital capacities of the 10 subjects in a sitting position and in a supine (lying) position. At the 0.05 significance level, test the claim that the position has no effect, so the mean difference is zero.

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SubjectA CD E F GH Sitting 4.66 5.70 S.37 3.34 3.77 7.43 4.15 6.21 5.90 .77 Supine 4.63 6.34 5.72 3.23 3.60 6.96 3.66 5.81 5.61 5.33 Based on data from "Validation of Esophageal Balloon Technique at Different Lung Volumes and Postures," by Baydur et al., Journal of Applied Physiology, Vol. 62, No.