Below is a partial multiple regression computer output based on a quadratic regression model to predict student enrollment at a local university.The dependent variable is the annual enrollment,given in thousands of students.The independent variable X is the increase in tuition stated in thousands of dollars per year,and X2 is the square of the tuition increase given in squared thousands of dollars per year.Interpret β0 (the y-intercept)and β1 (the β coefficient for the X variable).Does the parabola open upward or downward? Why?
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