Question 1 An investigation of the relationship between traffic flow (measured in cars per day) and lead content (measured in micrograms per gram of dry weight) in the bark of trees near the highway yielded the following summary statistics: Lead Content (micrograms per gram dry weight) Traffic Flow (cars/day) Sample Mean X-variable 680 Jom BU Y-variable 1750 Sample Standard Deviation The correlation between lead content and traffic flow was found to be r = 0.6 and a scatterplot showed the form to be linear. Based on context, which is the X-variable and which is the Y-variable? [Choose ] 240 [Choose ] 800 2 pts TAO Ti At

An investigation of the relationship between traffic flow (measured in cars per day) and lead content (measured in micrograms per'gram of dry weight) in the bark of trees near the highway yielded the following summary statistics: The correlation between lead content and traffic flow was found to be r=0.6 and a scatterplot showed the form to be linear. Based on context, which is the X-variable and which is the Y-variable? X-variable