The enrollment in the College of Business at Midwestern University by quarter from 2009 to Spring 2013 is ...

         The enrollment in the College of Business at Midwestern   University by quarter from 2009 to Spring 2013 is:                                                        Quarter        Year                       Winter                Spring                 Summer                    Fall      2009                        2,003                  1,871                     714                          2,318      2010                         2,174                   2,069                     840                         2,413      2011                         2,370                  2,254                      927                         2,704      2012                         2,625                  2,478                       1,136                      3,001     2013                        2,803                  2,668                      _____                     ______                Using the   ratio-to-moving-average method:       a. Determine   the four quarterly indexes.        b. Interpret   the quarterly pattern of enrollment. Does the seasonal variation surprise   you?   c. Compute   the trend equation, and forecast the 2014 enrollment by quarter.