You are given the task of forecasting demand for the swim outfit collection of Sunny Wear Inc. As anticipated, you observe that demand is highly seasonal. The following table gives the quarterly demand data (Sales in thousands of units) for the years 2011 to 2014.

Quarter	2011	2012	2013	2014
1	115	95	120	115
2	70	82	89	90
3	10	12	13	12
4	30	34	40	45

Using regression analysis as the first step, develop a forecasting model with quarterly seasonal indices for Sunny Wear. Forecast demand for each of the quarters for the year 2015. You may use the following values for the intercept and slope of your regression line. Intercept 67.9 Slope -0.841