You are given the task of forecasting demand for the ski outfit collection of Snowful 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 2018 to 2021.

Quarter	2018	2019	2020	2021
1	125	100	140	155
2	75	87	99	110
3	15	22	32	32
4	38	39	45	60

Using regression analysis as the first step, develop a forecasting model with quarterly seasonal indices for Snowful Wear. Forecast demand for each of the quarters for the year 2022. You may use the following values for the intercept and slope of your regression line.

Intercept 70.43

Slope 0.347