Business at Tina's Floral Shop can be viewed as falling into three distinct seasons: (1) Christmas (November and December); (2) Mother's Day (late April to May); and (3) all other times. Time Series Analysis and Forecasting of Average weekly sales ($) during the past four years are shown below:

a) Find the missing St* It. (Show Calculation)

b) Find the missing St. (Show Calculation)

c) Complete the Forecast for Year 5. (Show Calculation)

Quarterly Sales Data for Tina's Floral Shop \begin{tabular}{|l|r|} \hline & \multicolumn{1}{|c|}{ Coefficients } \\ \hline Intercept & 1448.501539 \\ \hline Sales & 34.39781177 \\ \hline \end{tabular}