The following table shows federal expenditures E, in billions of dollars, on Medicare t years after 2004.
t0234 E269.96298.14329.09375.61A: Find the equation of the regression line.B: Plot the data along with the regression line.C: Explain in practical terms the meaning of the slope of the regression equation.D: What expenditure does the regression line predict for 2010?
What will be an ideal response?
A: 
?
B:
?
C: During the period from 2004 to 2007, federal Medicare expenditures increased by about 25.39 billion dollars each year.
?
D: 413.40 billion dollars
Mathematics
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