(a) Construct a time series plot. What type of pattern exists in the data? The time series plot shows a horizontal pattern, but there is also a seasonal pattern in the data. The time series plot shows a horizontal pattern and no seasonal pattern in the data. The time series plot shows a linear trend and no seasonal pattern in the data. The time series plot shows a linear trend and a seasonal pattern in the data. x1=1 if quarter 1,0 otherwise; x2=1 if quarter 2,0 otherwise; x3=1 if quarter 3,0 otherwise y^t= (c) Compute the quarterly forecasts for the next year based on the model you developed in part (b). (Round your answers to two decimal places.) quarter 1 forecast quarter 2 forecast quarter 3 forecast quarter 4 forecast 1,t=12 for quarter 4 in year 3 . (Round your numerical values to three decimal places.) y^t=.417+0.219x14.188x21.594x3+0.406 x (e) Compute the quarterly forecasts for the next year based on the model you developed in part (d). (Round your answers to two decimal places.)