How big is the home field advantage in the National Football League (NFL)? To investigate, we select a sample of 80 games from t
he 2011 regular season1 and find the home team scored an average of 25.16 points with a standard deviation 10.14 points. In a separate sample of 80 different games, the away team scored an average of 21.75 points with a standard deviation of 10.33 points. Use this summary information to find a 90%c onfidence interval for the mean home field advantage, µH- µA, in points scored. The 90% confidence interval is______ to________ .
