The U.S. government's "Cash for Clunkers" program encouraged individuals to trade in their old gas-guzzlers for new, more efficient vehicles. At, do the data below support the hypothesis that the gain in mpg was more than 5 mpg?

Hint: The null hypothesis is Ho:mpg.

Miles per Gallon (mpg) for 14 "Cash for Clunkers" Trade-ins Buyer New Car Old Car Buyer 1 23.0 20.1 Buyer 2 20.3 15.8 Buyer 3 24.6 19.1 Buyer 4 25.3 17.4 Buyer 5 20.6 13.9 Buyer 6 26.8 15.6 Buyer 7 22.9 17.1 Buyer 8 26.3 16.1 Buyer 9 27.2 19.2 Buyer 10 28.0 19.8 Buyer 11 18.9 17.7 Buyer 12 23.8 21.8 Buyer 13 27.8 18.5 Buyer 14 27.1 19.4