The quarterly earnings of a large microcomputer company have been recorded for the years 2011-2014.These data (in millions of dollars)are shown in the accompanying table. 
Use an appropriate moving average to measure the quarterly variation by computing the seasonal (quarterly)indexes.
Definitions:
Exponential Smoothing
A method used in time series forecasting that applies decreasing weights to past observations.
3-year Moving Averages
A method to smooth out data over a three-year period to identify trends and patterns.
Seasonal Variation
Refers to periodic fluctuations in data or variables that occur at or depend on specific times of the year.
Moving Average Method
A statistical technique used to analyze time series data by calculating averages of different subsets of the complete dataset.
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