#2: Causal Model Welder Plus used to have major contracts to produce the Megatron dual chips. The production of dual chips has been declining for the last three years which has contributed to the challenges of forecasting because Welder Plus has not been able to find replacement chips for its product lines. Below is the demand for the past 12 quarters: 2020 2021 2022 Q1 4800 Q1 3500 Q1 3200 Q2 3500 Q2 2700 Q2 2100 Q3 4300 Q3 3500 Q3 2700 Q4 3000 Q4 2400 Q4 1700 Use regression and seasonal indexes (i.e. decomposition technique with linear regression) to forecast demand for the next four quarters for the year 2023