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.
Year
Jan
Feb
March
April
May
June
July
Aug.
Sept.
Oct.
Nov.
Dec
2007
348
352
330
347
339
370
380
392
400
410
405
367
2008
350
341
345
355
342
350
370
395
410
401
405
365
2009
348
349
350
350
342
377
369
400
410
406
400
370
Develop a time series plot of the data. Does the data appear random on the plot?
What will be an ideal response?
The data definitely does not appear to be random; it has a repeating cycle.
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