Question: U.S. cellular phone subscribership has been reported as shown here for the 19962007 period. a. Fit a linear trend equation to the time series. Using

U.S. cellular phone subscribership has been reported as shown here for the 1996€“2007 period.

a. Fit a linear trend equation to the time series. Using this equation, determine the trend estimate for 2013.
b. Fit a quadratic equation to the time series, then use the equation to determine the trend estimate for 2013.
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 (Millions) 44.0 55.3 69.2 86.0 109.5 128.4 Subscribers (Millions) 140.8 158.7 182.1 207.9 233.0 255.4 5 Year 1996 1997 1998 1999 2000 2001 Year 2002 2003 2004 2005 2006 2007 2

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a A portion of the Minitab printout is shown below along with the plot In this time series 1996 is period 1 and 2013 is period 18 With x the year code ... View full answer

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