Luis A. Afonso
Posts:
4,661
From:
LIsbon (Portugal)
Registered:
2/16/05


Re: Intrapermutations to test two different mean values
Posted:
Feb 15, 2013 9:14 AM


___Hsu solution (same data)
____C.I. 5% significance ____female spider´s length (mm)= 8.127, male= 5.917, difference = 2.210 ____sample variances = 1.285, 0.440 ____ sizes = 30, 30 S= sqrt (varfemale/30, varmale/30) = 0.240 _____ Hsu solution: [difference ? T(30df)* S, difference + T(30df)* S] = [2.210  2.0423*0.240, 2.210 + 2.0423*0.240] = [1.720, 2.700] Which accounts pretty well with the permutation´s results: [1.76, 2.67] No surprise because samples are of same size in spite of large variance ratio female/male: 0.34. Ranges female 10.00 5.90= 4.10, male 7.50 4.70= 2.80 Luis A. Afonso

