Decrouez and Hall (2014) showed by numerical and asymptotic arguments based on Decrouez and Hall (2013) that when
n1 = n/2+0.15n3/4 (rounded to the nearest integer) and n2 = n−n1 the split sample method greatly reduces the oscillations
of the coverage of the interval, without increasing the interval length. In the remainder of the paper, whenever n1 and n2
need to be specified, we will use these values.