Refer to the Forbes magazine 2015 report on the financial standings of each team in the National Football League (NFL), Exercise 2.26. The table listing the current value (without deduction for debt, except stadium debt) and operating income for each team is reproduced above.

a. Propose a straight-line model relating an NFL team's current value (y) to its operating income (x).

b. Fit the model to the data using the method of least squares.

c. Interpret the least squares estimates of the slope and y-intercept in the words of the problem.

d. Statistically assess the adequacy of the model. Do you recommend using it to predict an NFL team's value?

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Operating Income ($mil) Current Value 1-Yr Value Debt/ Revenue ($mil) Value (%) ($mil) Rank Team Change (%) Dallas Cowboys New England Patriots Washington Redskins New York Giants San Francisco 49ers New York Jets Houston Texans 4,000 3,200 2,850 2,800 2,700 2,600 2,500 2,450 2,400 1,950 1,940 1,930 1,900 1,875 1,870 1,850 1,670 1,590 1,560 1,540 1,530 1,525 1,515 1,510 1,500 1,490 1,480 1,450 1,445 1,440 1,430 1,400 25 5 620 494 439 400 427 383 383 352 370 347 346 345 344 321 334 322 303 281 325 308 307 304 322 313 313 318 315 290 296 298 285 296 270 195 124.9 105.2 123.7 118.4 114.6 85.7 88.7 63.3 65.8 59.8 54 90.1 43.6 41.5 25.4 34.5 77.8 57.2 48.6 64.8 70 55.2 34.7 50.5 67 34 55.5 36.1 39 44.2 18 21 23 6. Chicago Bears Philadelphia Eagles Green Bay Packers Denver Broncos Baltimore Ravens 8. 4 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 6. 14 11 3 6. 19 51 31 4 10 5 Pittsburgh Steelers Indianapolis Colts Seattle Šeahawks Miami Dolphins Atlanta Falcons Minnesota Vikings Carolina Panthers Arizona Cardinals Kansas City Chiefs San Diego Chargers New Orleans Saints Tampa Bay Buccaneers Cleveland Browns 5 12 13 10 Tennessee Titans Jacksonville Jaguars St Louis Rams Cincinnati Bengals Detroit Lions Oakland Raiders Buffalo Bills 56 8. 50 19 14 14 50