Table $2$ presents the Gap$s$ quarterly sales data for $1985Q1$ through $2006Q4.$ Analyze the data and answer the following questions:

$2\mathrm{.}1.$ Create a time$-$series plot $of$ the Gap Sales. Describe the pattern$(s)of$ the time series you see $in$ the graph.

$2\mathrm{.}2$ Calculate the seasonal factors $(SI)$ and then the seasonal indices $(S)$ based $on$ the $1985Q1-2006Q4$ data. Are they consistent with your expectations? Explain $in$ detail.