Suppose there is no cyclical component. quarterly billing, Ask an Expert

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Find the seasonal index, trend line and forecast it.

Quarterly billing for water usage is shown below.

	Year
Quarter	1	2	3	4
Winter	64	66	68	73
Spring	103	103	104	120
Summer	152	160	162	176
Fall	73	72	78	88

a. Find the seasonal index for each quarter.

b. Depersonalize the data.

c. Find the trend line.

d. Assume there is no cyclical component (don't forget: there IS a seasonal component). Forecast the summer billing for year 5.

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