U S cellular phone subscribership has been reported as shown here
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?
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