<PRE><B>Question 53391</B>
reading value reading value 
45 $9560 65 $8660 
50 $9435 75 $8110 
55 $9285 90 $7410 
60 8960

 a.compute the linear regression equation for these data.
Using the TI-83 Linear Regression capability I find the following:
expected trade = -50.1856..(mileage in thousands)+11928.81
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b. On the basis of this model, what is the expected trade-in value of a similar Ford Explorer with 80,000 miles on the odemeter? Round to the nearest whole number. 
ev(80)=-50.1856(80)+11928.81
ev(80)=7914
Cheers,
Stan H.
</PRE>