good afternoon,

i am PhD candidate

for statistics part (mean)

Sample size = (^2 NP(1-P))/(d^2 (N-1)+^2 P(1-P))= (2.712000.50.5)/((0.170.17199)+(2.710.50.5))=20

the degree of accuracy expressed as a proportion =0.17 ( is there a reference for this assuming )