Six years of quarterly data of a seasonally adjusted series are used to estimate a linear trend

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Six years of quarterly data of a seasonally adjusted series are used to estimate a linear trend model as In addition, quarterly seasonal indices are calculated as Ŝ1 =

0.93, Ŝ 2 = 0.88, Ŝ 3 = 1.14, and Ŝ 4 = 1.05.

a. Interpret the first and fourth quarterly indices.

b. Make a forecast for all four quarters of next year.

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