Question

NARRBEGIN: SA_89_91
The number of employees on the payroll at a computer software company is recorded at the start of each month from January 2007 to December 2009. These data are shown below.
YearJanFebMarchAprilMayJuneJulyAug.Sept.Oct.Nov.Dec
2007348352 330 347339370380392400410405367
2008350341 345 355342350370395410401405365
2009348349 350 350342377369400410406400370
NARREND
Perform a runs test and compute a few autocorrelations to determine whether this time series is random.

Answer

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