Cell Phones The table gives the number, in millions, of U.S. cellular telephone subscribers.
a. Create a scatter plot for the data, with x equal to the number of years after 1985. Does it appear that the data could be modeled with a quadratic function?
b. Find the quadratic function that is the best fit for these data, with x equal to the number of years after 1985 and y equal to the number of subscribers in millions.
c. Use the model to estimate the number in 2011.
d. What part of the U.S. population does this estimate equal if the U.S. population is 310 million?
Year | Subscribers (millions) | Year | Subscribers (millions) |
1985 | 0.340 | 1998 | 69.209 |
1986 | 0.682 | 1999 | 86.047 |
1987 | 1.231 | 2000 | 109.478 |
1988 | 2.069 | 2001 | 128.375 |
1989 | 3.509 | 2002 | 140.767 |
1990 | 5.283 | 2003 | 158.722 |
1991 | 7.557 | 2004 | 182.140 |
1992 | 11.033 | 2005 | 207.896 |
1993 | 16.009 | 2006 | 233.041 |
1994 | 24.134 | 2007 | 255.396 |
1995 | 33.786 | 2008 | 270.334 |
1996 | 44.043 | 2009 | 285.694 |
1997 | 55.312 |
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