Data on tuition and mid-career salary are collected from a number of universities and colleges. The result of the data c

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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 = − 0.81 x + 165
where x = annual tuition and y = average mid-career salary of
graduates, both in thousands of dollars.
Which quantity is the independent variable?
annual tuition
average mid-career salary of graduates
According to this model, what is the average salary for a
graduate of a college or university where the annual tuition is
$30,000?
$
What is the slope of this regression model?