A.The average family size was reported as 3.18. A random sample of families in a particular school district resulted in the following family sizes:

5 4 5 4 4 3 6 4 3 3 5 6 3 3 2 7 4 5 2 2 2 3 5 2

At a 0.05, does the average family size differ from the national average?

B. The average monthly cell phone bill was reported to be $50.07 by the U.S. Wireless Industry. Random sampling of a large cell phone company found the following monthly cell phone charges:

55.83 49.88 62.98 70.42 60.47 52.45 49.20 50.02 58.60 51.29

At the 0.05 level of significance can it be concluded that the average phone bill has increased?