Ballplayers have been signing ever larger contracts. The highest salaries (in millions of dollars per season) for some notable players are given in the following table. Player Year Salalry(million $)
Nolan Ryan 1980 1
George Foster 1982 2
Kirby Puckett 1990 3
Jose Canseco 1990 4.7
Roger Clemens 1991 5.3
Ken Griffey, Jr. 1996 8.5
Albert Belle 1997 11
Pedro Martinez 1998 12.5
Mike Piazza 1999 12.5
MO Vaughn 1999 13.3
Kevin Brown 1999 15
Carlos Delgado 2001 17
Alex Rodriguez 2001 22
Manny Ramirez 2004 22.5
Alex Rodriguez 2005 26

Required:
a. Examine a scatterplot of the data. Does it look straight?
b. Find the regression of Salary w.. Year and plot the residuals. Do they look straight?
c. Re-express the data, if necessary, to straighten the relationship.
d. What model would you report for the trend in salaries?