Question: Many corporations make use of the Wide Area Telephone System (WATS), where for a fixed rent per month, the corporation can make as many long distance calls as it likes. Depending on the area of the country in which the corporation is located, it can rent a WATS line for certain geographic bands. For example, in Ohio, these bands might include the following states:

Band I: Ohio
Band II: Indiana Pennsylvania
Kentucky Tennessee
Maryland Virginia
Michigan West Virginia
North Carolina Washington, DC
Band III: 32 Easter and Midwestern states, Plus Washington DC

To monitor the use of the WATS lines, a corporation selected a random sample of 12 calls from each of the following areas in a given month, and recorded the lenth of the conversation (in minutes) for each call. (Band III excludes states in Band II and Ohio).

Ohio 2 3 5 8 4 6 18 19 9 6 7 5
BAND II 6 8 10 15 19 21 10 12 13 2 5 7
BAND III 12 14 13 20 25 30 5 6 21 22 28 11

Perform an analysis variance to compare the mean lengths of calls for the three areas. Use α = .05