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Quarterly billing for water usage is shown below. Year Quarter 1 2 3 4 Winter 64 66 68 73 Spring 103 103 104 120

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. Deseasonalize the data. C. Find the trend line. d. Assume there is no cyclical component and forecast the summer billing for year 5.

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