Concentration of Retinol by Vitamin Use The figure below displays the relationship between vitamin use and the concentration of retinol (a micronutrient) in the blood for a sample of n= 315individuals. (The full dataset, with more variables, is available inNutritionStudy.) Does there seem to be an association between these two variables?

Regular- Vitamin Use Occasional No 200 400 800 800 1000 1200 1400 1800 1800 Plasma Retinol