During the early days of the Internet, growth in the number of users worldwide could be approximated by an exponential function. The following table gives the number of worldwide users of the Internet.

Use a calculator with exponential and logistic regression capabilities to complete the following.
(a) Letting t represent the years since 1990, plot the number of worldwide users of the Internet on the y-axis against the year on the t-axis. Discuss the shape of the graph.
(b) Use the exponential regression function on your calculator to determine the exponential equation that best fits the data. Plot the exponential equation on the same graph as the data points. Discuss the appropriateness of fitting an exponential function to these data.
(c) Use the logistic regression function on your calculator to determine the logistic equation that best fits the data. Plot the logistic equation on the same graph. Discuss the appropriateness of fitting a logistic function to these data. Which graph better fits the data?
(d) Assuming that the logistic function found in part (c) continues to be accurate, what seems to be the limiting size of the number of worldwide Internet users?

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Year 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Number of Users (in millions) 16 36 70 147 248 361 513 587 719 817 1018 1093 1319 Year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Number of Users (in millions) 1574 1802 1971 2267 2497 2802 3079 3366 3696 4156 4313 4574