Dataset: paddyfields_ttest.dat Source: J-Z. Pan, Z-X. Lu(1998). "Relationship Between Paddy Soil Adhesion to Steel and to Rubber," Journal of Terramechanics, Vol. 35, pp. 155-158. Description: 43 pairs of samples of adhesion of paddy soil to steel and rubber. Analyzed as independent samples, but seems it should be paired. Variables/Columns Sample number 7-8 Place (site) id 15-16 Adhesion to steel (kPa) 20-24 Adhesion to Rubber (kPa) 28-32