The following table shows Google's annual revenue for 2009 to 2014 (The Wall Street Journal, august 2014).
Year Period (t) Revenue ($ billions)
2009................1................................23.7
2010................2................................29.3
2011................3................................37.9
2012................4................................50.2
2013................5................................59.8
2014................6................................66.7
a. Construct a time series plot. What type of pattern exists in the data?
b. Develop a linear trend equation for this time series.
c. What is the average revenue increase per year that Google has been realizing?
d. Compute an estimate of Google's revenue for 2015.