Essay
The number of reported accidents at a manufacturing plant located in Flint,Michigan,is recorded at the start of each month.State investigators are responding to a recent complaint by reviewing data from past complaints over sets of three years at a time.The data from 2006-2008 are provided in the table below: 
Is this time series random? Perform a runs test and compute a few autocorrelations to support your answer.
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Correct Answer:
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