The following table reports the percentage of stocks in a portfolio for nine quarters from2007 to 2009.Quarter Stock %1st— XXXXXXXXXX82nd— XXXXXXXXXX03rd— XXXXXXXXXX94th— XXXXXXXXXX11st—...

The following table reports the percentage of stocks in a portfolio for nine quarters from2007 to 2009.Quarter Stock %1st—2007 29.82nd—2007 31.03rd—2007 29.94th—2007 30.11st—2008 32.22nd—2008 31.53rd—2008 32.04th—2008 31.91st—2009 30.0a. Construct a time series plot. What type of pattern exists in the data?b. Use exponential smoothing to forecast this time series. Consider smoothing constantsof a  .2, .3, and .4. What value of the smoothing constant provides the most accurateforecasts?c. What is the forecast of the percentage of stocks in a typical portfolio for the secondquarter of 2009?