tical program is recommended.

er the following time series.

$\backslash$table$[[$Quarter$,$Year $1,$Year $2,$Year $3],[1,70,67,61],[2,48,40,50],[3,57,59,52],[4,77,80,71]]$

Construct a time series plot.

$$ What type of pattern exists in the data?

The time series plot shows a trend pattern with no seasonal pattern present.

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 with no seasonal pattern present.

$$ The time series plot shows a trend pattern, but there is also a seasonal pattern in the data.

Use the following dummy variables to develop an estimated regression equation to account for seasonal effects in the data:

$x_1=1$ if quarter $1,0$ otherwise; $x_2=1$ if quarter $2,0$ otherwise; $x_3=1$ if quarter $3,0$ otherwise.

hat$(Y)=$

$$

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

quarter $1$ forecast

quarter $2$ forecast

quarter $3$ forecast quarter $4$ forecast

$$

$$