Football team owners are constantly in competition for good players. The better the winning percentage, the more likely the team will provide good business returns for the owners. Of course, the resources that each of the 32 teams has in the National Football League (NFL) vary. Does the size of the payroll matter? Here are a scatterplot and a regression showing
the association between team salaries in the NFL and winning percentage:

s = 2.82 R-Sq = 7.7%

a) State the hypotheses about the slope.

b) Perform the hypothesis test and state your conclusion in context.

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144 12+ 10+ 8+ 2- 0+ O 10 20 30 40 50 60 70 80 90 100110120130 Salary (S million) Wins Predictor SE(Coeff) t-ratio P-value Coeff Intercept 3.964 0.45 1.783 0.6560 Salary ($M) 0.062 0.1244 0.039 1.58