The following table shows the subscribership of cellular telephones in the United States (in millions) for even-numbered years between 2000 and 2008. 

a. Plot the data by letting t = 0 correspond to 2000. Discuss how well the data fit a straight line.

b. Determine a linear equation that approximates the number of subscribers using the points (0, 109.48) and (8, 270.33).

c. Repeat part b using the points (2, 140.77) and (8, 270.33).

d. Discuss why your answers to parts b and c are similar but not identical.

e. Using your equations from parts b and c, approximate the number of cellular phone subscribers in the year 2007. Compare your result with the actual value of 255.40 million.

Transcribed Image Text:

Year Subscribers (in millions) 2000 2002 2004 2006 2008 109.48 140.77 182.14 233.04 270.33