Problem 5 which seeks to determine the significant relationship among the study
variables, level of self-esteem and motivation for learning of nursing students in 3 rd year of private University in Nakhonpathom , the Pearson Product Moment of Correlation (PPM) was used. When a
relationship between two variables is sought and the data is nominal and in the form of
interval /ratio, the Pearson Product Moment of Correlation of Coefficient is appropriate to use
(Shaughnessy, 2002).