I keep getting different answers and just wanted to check my work and see if any of my previous outcomes matches and if I'm doing everything correctly.

2. The National Football League (NFL) records lots of stats on all participating teams. One such stat is the percentage of games won per season (WinPet) and another is the number of passing yards per attempt (Yds/Att). The following data is from the 2011 season. The NFL is interested in the effect of Yds/ Att on WinPet. Team Yds/ Att. WinPet Arizona Cardinals 6.5 50 Atlanta Falcons 7.1 63 Carolina Panthers 7.4 38 Chicago Bears 6.4 50 Dallas Cowboys 7.4 50 New England Patriots 8.3 81 Philadelphia Eagles 7.4 50 Seattle Seahawks 6.1 44 St. Louis Rams 5.2 13 Tampa Bay Buccaneers 6.2 25 (a) Develop the estimated regression equation that could be used to predict the percentage of games won given the average number of passing yards per attempt. (b) Use the estimated equation in (a) to predict the percentage of games won by the Kansas City Chiefs, whose Yds/Att was 6.2 in 2011. 3. A sales manager collected the following data on annual sales for new customer accounts and the number of years of experiences for a sample of 10 salespersons. Salesperson Years of experience Annual sales ($0,000s) Employee 1 80 Employee 2 97 Employee 3 92 Employee 4 102 Employee 5 6 103 Employee 6 18 111 Employee 7 10 119 Employee 8 10 123 Employee 9 11 117 Employee 10 13 136 (a) Develop the estimated regression equation that could be used to predict annual sales given the years of experience. (b) Use the estimated equation in (a) to predict annual sales for a salesperson with 9 years of experience