2. In the 2010-11 National Hockey League (NHL) regular season, the number of penalty minutes per game for each of the 30 teams ranged from a low of 8.8 to a high of 18.0 for the New York Islanders. The mean for all 30 teams is 12.2 penalty minutes per game with a standard deviation of 2.25. If we assume this is a sample of all teams in all seasons, test to see if this provides evidence that the mean number of penalty minutes per game for a hockey team is less than 13. Use a significance level of 0.1. Show all details of the test.

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