(a) Construct a time series plot. (a) Construct a time series plot. What type of pattern exists in the data? The time series plot shows only seasonal effects. The time series plot shows only a linear trend. The time series plot shows both a linear trend and seasonal effects. The time series plot shows neither a linear trend nor seasonal effects. quarter 2, 0 otherwise; Qrt3 = 1 if quarter 3, 0 otherwise. Y^t= Based only on the seasonal effects in the data, compute estimates of quarterly sales (in $1,000 s) for year 6. quarter1forecastquarter2forecastquarter3forecastquarter4forecast$$$$thousandthousandthousandthousand Y^t= quarter 1 forecast $ thousand quarter 2 forecast $ thousand quarter 3 forecast $ thousand quarter 4 forecast $ (a) Construct a time series plot. (a) Construct a time series plot. What type of pattern exists in the data? The time series plot shows only seasonal effects. The time series plot shows only a linear trend. The time series plot shows both a linear trend and seasonal effects. The time series plot shows neither a linear trend nor seasonal effects. quarter 2, 0 otherwise; Qrt3 = 1 if quarter 3, 0 otherwise. Y^t= Based only on the seasonal effects in the data, compute estimates of quarterly sales (in $1,000 s) for year 6. quarter1forecastquarter2forecastquarter3forecastquarter4forecast$$$$thousandthousandthousandthousand Y^t= quarter 1 forecast $ thousand quarter 2 forecast $ thousand quarter 3 forecast $ thousand quarter 4 forecast $