1. What was the mean number of U.S. states in which all of the beer brands were sold in in 2008?
2. What was the mean number of U.S. states in which all of the beer brands were sold in in 2012?
3. Was there a significant difference in the number of states in which these beer brands were sold in 2008 versus 2012? Report the results of the t-test as follows: t(df value) = ___, and p-value.