wilcox.test(c(9,9.5,9.75,10,13,9.5),c(11.5,12,9,11.5,13.25,13))
#
#   Wilcoxon rank sum test with continuity correction
#
#data:  c(9, 9.5, 9.75, 10, 13, 9.5) and c(11.5, 12, 9, 11.5, 13.25, 13)
#W = 9, p-value = 0.1705
#alternative hypothesis: true location shift is not equal to 0

n.wilcox.ord(power = 0.8, alpha = 0.05, t, p, q)