The following is the number of retirees receiving benefits from
The following is the number of retirees receiving benefits from the State Teachers Retirement System of Ohio from 1991 until 2012.


a. Plot the data.
b. Determine the least squares trend equation. Use a linear equation.
c. Calculate the points for the years 2000 and 2010.
d. Estimate the number of retirees that will be receiving benefits in 2015. Does this seem like a reasonable estimate based on the historical data?
e. By how much has the number of retirees increased or decreased (per year) on average during theperiod?
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