Consider the following time series data.

Excel File: data$17-29.$xls

a$.$ Construct a time series plot.

unius suries puos s

What type of pattern exists in the data?

Quarter $3,0$ otherwise. $($to $3$ decimals if necessary$).$

hat$(Y{)}_t=,+,Qtr1-,Qtr2-,Qtr3+,t$

c$.$ Compute the quarterly forecasts for next year $($to $2$ decimals$).$

Quarter $1$ forecast

Quarter $2$ forecast

Quarter $3$ forecast

Quarter $4$ forecast