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 years) and annual salaries (in dollars) were also provided. These four variables were analyzed by Pearson correlations. O Interval Question: Ratio What is the scale for the income variable? C Nominal Ordinal