Data on tuition and mid-career salary are collected from a number of universities and colleges. The result of the data collection is the linear regression model g; = 0.83m + 156 where a: = annual tuition and y = average mid-career salary of graduates, both in thousands of dollars. 1. Which quantity is the independent variable? 0 annual tuition 0 average mid-ca reer salary of graduates 2. According to this model, what is the average salary for a graduate of a college or university where the annual tuition is $30,000? _ 3. What is the slope of this regression model