$(**)$ While searching through your class notes, you stumble across the following forecasting model:

SEASONAL INDICES

Summer

$1\mathrm{.}25$

Fall

$0\mathrm{.}90$

Winter

$0\mathrm{.}75$

Spring

$0\mathrm{.}90$

Based only on this information, answer the following true$/$false questions. Justify your answers.

True or false? The forecast model is a time series model.

True or false? The forecast model suggests that the variable being forecasted is experiencing an upward trend in demand.

True or false? The variable being forecasted experiences a sharp increase during the summer months, followed by lower levels in the winter months.