Question: U.S. cellular phone subscribership has been reported as shown below for the 19932004 period. a. Fit a linear trend equation to the time series. Using

U.S. cellular phone subscribership has been reported as shown below for the 1993€“2004 period.

Subscribers Subscribers (Millions) (Millions) Year Year 1993 86.0 16.0 1999 1994 24.1 2000 109.5 2001 1995 33.8 128.4 19

a. Fit a linear trend equation to the time series. Using this equation, determine the trend estimate for 2010.
b. Fit a quadratic equation to the time series, then use the equation to determine the trend estimate for 2010.
c. Construct a graph of the time series along with the equations fitted in parts (a) and (b). Which equation appears to better fit the data?

Subscribers Subscribers (Millions) (Millions) Year Year 1993 86.0 16.0 1999 1994 24.1 2000 109.5 2001 1995 33.8 128.4 1996 44.0 2002 140.8 1997 55.3 2003 158.7 1998 69.2 2004 182.1

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