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Global temperatures are increasing. Great Lakes water levels meander up and down (see Figure 13.29, page 727). Do all environmental processes exhibit time series patterns? Consider a time series of the annual precipitation (inches) in New Jersey from 1895 to 2007.27

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PRECIPITATION

(a) Make a time series plot of the precipitation series.

(b) Perform the runs test on the series and report a P-value for the test.

(c) Make a lagged time series plot and calculate the correlation between yt and yt−1.

(d) Based on parts (a), (b), and (c), what do you conclude about the precipitation process?