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The following data give the gasoline retail prices per gallon in the United States for each of the years from 1990 to 2002.

Year

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

Price

1.16

1.14

1.13

1.11

1.11

1.15

1.23

1.23

1.06

1.17

1.51

1.46

1.36

(a) Find the estimated regression line.

(b) Test the hypothesis, at the 5 percent level of significance, that

β = 0.

 
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