A researcher examines two relationships: The relationship b…

A reseаrcher exаmines twо relаtiоnships: The relatiоnship between patients’ age and mean periodontal probing depth. Both variables are continuous, approximately normally distributed, and have a linear relationship. The relationship between patients’ oral-health risk category (low, moderate, or high) and their ranked level of treatment adherence. Which correlation coefficients are most appropriate?