With the exception of the 2007 New England Patriots, the Minnesota Vikings scored more points during the 1998 regular season than any other team in NFL history. Your friend at work believes that the number of first downs per NFL game is higher for teams that score more points per game. You have access to all Minnesota Vikings team performance data since the team’s inception (i.e., since 1961). What statistical analysis would you use to substantiate or rebuff your friend’s claim? Do you need additional data? Why or why not?