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 ˆ y = − 0.8 x + 166 where x = annual tuition and y = average mid-career salary of graduates, both in thousands of dollars. Which quantity is the independent variable? average mid-career salary of graduates annual tuition Correct According to this model, what is the average salary for a graduate of a college or university where the annual tuition is $30,000? $ 24166 Incorrect What is the slope of this regression model?