The time series of occupancy in a seaside resort in Queensland had the following chart:

The regression equation was found to be,

Estimated Occupancy = 68.3 + 128.5Q₁- 10.17Q₃+ 68.03Q₄+ 0.47t

Where, t = 0 in the March quarter of 2018 and Q_1,Q₃and Q₄are the dummy variables for the March, September and December quarters, respectively. June is the benchmark quarter.

A)Briefly explain two components of a time series you can identify in the chart.

B)Interpret the coefficient of the September quarter.