The gross domestic product (GDP) is the total U.S. output of goods and services valued at market prices. The quarterly GDP values (in billions of current dollars) for the period 2011-2015 are given in the accompanying table. Using weights w = .5 and n = .5, calculate Holt forecasts for the four quarters of 2016.

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Year Year Quarter GDP Quarter GDP 2013 2013 2011 2011 2011 2011 15,238.4 15,460.9 15,587.1 15,785.3 15,973.9 16,121.9 16,227.9 16,297.3 16,440.7 16,526.8 3 4 16,727.5 16,957.6 16,984.3 17,270.0 17,522.1 17,615.9 17,649.3 17,913.7 18,060.2 18,164.8 2014 2014 4 2012 2012 2012 2012 2014 2014 2015 3 2015 2015 2015 2 3 2013 2013