The following data show the quarterly sales of a major auto manufacturer for the years 8 through 10. 
a.Compute the four-quarter moving average values for the above time series.
b.Compute the seasonal factors for the four quarters.
c.Use the seasonal factors developed in Part b to adjust the forecast for the effect of season for year 9.
Definitions:
Sample Mean
The average value computed from a sample of data, representing the central tendency of the sample.
Standard Error
The standard deviation of the sampling distribution of a statistic, typically the mean, indicating the precision of an estimate.
Population Standard Deviation
A measure of the dispersion or spread of a set of data points in a population from the mean of that population.
Effect Size
A statistical measure that indicates the strength of the difference or relationship between two variables in a numerical scale.
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