In Exercise find the required linear model as follows: If you do not have a graphing calculator or spreadsheet program, use the first and last data points to determine a line. If you do have a graphing calculator or spreadsheet program, find the least-squares regression line.
Social Science The accompanying table shows how poverty-level income cutoffs (in dollars) for a family of four have changed over time (in large part because of inflation).
Year | 1980 | 1985 | 1990 | 1995 | 2000 | 2005 |
Income | 8414 | 10,989 | 13,359 | 15,569 | 17,604 | 19,971 |
(a) Find a linear model for the data, with x = 0 corresponding to 1980.
(b) Assuming the trend continues, what is the approximate poverty-level income cutoff in 2009? in 2011?
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