Problem

In Exercise find the required linear model as follows: If you do not have a graphing calcu...

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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Solutions For Problems in Chapter 2.3