Reviewing Data Sets

No Telephone?

Work Time

No Telephone?

For each one of the 50 states, the U.S. Census Bureau provides information about the percentage of households without a telephone. The percentage varies from state to state: In some states it is higher, while in others it is lower.

The box plot summarizes state telephone data for two different years—1960 and 1990.

  • What do the box plots tell us about how telephone ownership in the 50 states changed from 1960 to 1990? Write an explanation. Provide as much specific information as you can.