Find the seasonal index for each quarter


Quarterly billing for water usage is shown below.

Year 1 Year 2 Year 3 Year 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.

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Finance Basics: Find the seasonal index for each quarter
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