Description for Figure 4.1
Histogram of sample variances; a kernel density smoother is fitted.

Figure presenting the histogram of sampling variances. The frequency is on the y-axis, going from 0 to 8. The sampling variance is on the x-axis, going from 1.5 to 3.5. On the histogram, there are nine vertical bars of height 2, 8, 3, 2, 1, 6, 4, 1 and 1, for a total of 28 small areas. A kernel density smoother is fitted and added to the graph, emphasizing the bimodal shape of the sampling variances histogram.