Figure 13.8: Figure 13.7 A Perfect Relationship: Raw Scores vs. z Scores With a perfect relationship, a case’s z score on the X variable has exactly the same value as it does on the Y variable. In the panel on the left, the data point for boiling water occurs at the intersection of 212°F and 100°C. In the panel on the right, the data point is at the intersection of z scores of 1.63 on both axes.