A recent study revealed the typical American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens revealed they consumed the following amounts of coffee, reported in cups, yesterday.

At the .05 significance level, do these sample data suggest there is a difference between the national average and the sample mean from seniorcitizens?

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3.1 3.3 3.5 2.6 2.6 4.3 4.438 3.1 4.1 3.1 3.2