the coefficient of correlation, the greater the independence. If the data are totally independent, the true coefficient of correlation is zero. Fig. 3 shows the sample coefficient of correlation as an estimate of the true coefficient to be 0.74. This makes it pretty obvious that successive data points are not independent. Even if successive data points are nearly independent, it is possible for data points N observations apart to exhibit some correlation, which would be an indication that the data are not independent. The correlation plot of Fig. 4 starts at 0.74 for data points one observation apart, and shows the sample coefficient of correlation for data points n observations apart. The plot shows that the sample correlation coefficient starts to oscillate between positive and negative with relatively small absolute values after n reaches 100, clearly indicating that from then on there is no correlation i.e., the second set of 100 numbers is fully IID and exhibits no autocorrelation.