[Difficult problem] Show that the p-value for the two-stage sampling regime referred to in Figures 4.3 and 4.5 (with 20 observations and possibly a further 20 observations if the first set fails to attain statistical significance) is p = 2B(5; 20, )+ b(6; 20, ) B(7; 20,)+ {( 20,) [B (13-i; 20, )+B (27-1; 20, 1)]}+ b(14; 20, )B(13; 20,) = 0.0799.