Repeat the analysis of Section 9.2, replacing avrain by: (i) southRain, i.e., annual average rainfall in southern Australia; (ii) northRain, i.e., annual average rainfall in northern Australia. In the...

Repeat the analysis of Section 9.2, replacing avrain by: (i) southRain, i.e., annual average rainfall in southern Australia; (ii) northRain, i.e., annual average rainfall in northern Australia.

In the calculation

try the test with lag set to values of 1 (the default), 5, 20, 25 and 30. Comment on the different results.