Twenty people employed in the same industry took the Inventory Risk Survey Catalog (I- RiSC) and a problem solving test. The problem solving test presented 20 difficult word problems, and the score is the number of problems the person solved. Their ages (in year and annual salaries (in dollars) were also provided. These four variables were analyzed by Pearson correlations. O Spearman's rho Question: Point-Biserial To correlate two interval or ratio scale variables, use O correlation this type of correlation. Canonical correlation Pearson Correlation