Question 83419
the following table lists how poerty level income cutoffs (in dollars) for a family of four have changed over time 
year/income
1970/3968
1975/5500
1980/8414
1985/10989
1990/13359
1995/15569
2000/17603 
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Enter Data into a TI-83 or better:
Run the "Linear Regression" function on the data:
 
Let x be the year, with x = 0 corresponding to 1970, and y be the income in thousands of dollars. (note: symbol weird E x = 105, Weird Ex^2 = 2275, weird Ey=75.402, Weird Ey^2 = 968.270792, wierd Exy = 1460.97) 
A) PLOT THE DATA. DO THE DATA APPEAR TO LIE ALONG A SRAIGHT LINE?
Yes
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AGREE WITH YOUR ANSWER IN PART a?
r = 0.96 ; yes
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C)fIND THE EQUATION OF THE LEAST SQUARE LINE.
y = 519.99x +5051.797
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d) uSE YOUR ANSWER FROM PART c TO PREDICT THE POVERTY LEVEL IN THE YEAR 2015.
f(35) = 23252
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Cheers,
Stan H.