Return to the notes for Chapter 8Problem 8.12, page 160 from Zar (1999) Output from SigmaStatMann-Whitney Rank Sum TestWednesday, September 27, 2000, 15:12:39 Data source: Data 1 in NotebookNormality Test:Passed (P = 0.319)Equal Variance Test:Passed (P = 0.384)Group N Missingmales 7 0 females 6 0Group Median 25% 75%males 224.100 220.575 228.225 females 224.050 223.400 230.200 T = 47.000 n(small)= 6 n(big)= 7 P(est.)= 0.520 P(exact)= 0.534 The differences in the median values among the two groups are not great enough to exclude the possibility that the difference is due to random sampling variability; there is not a statistically significant difference (P = 0.534)Problem 8.13, page 159 from Zar (1999) Output from SigmaStatMann-Whitney Rank Sum TestWednesday, September 27, 2000, 15:15:41 Data source: Data 2 in NotebookNormality Test:Passed (P = 0.826)Equal Variance Test:Passed (P = 0.310)Group N Missingnorthern 7 0 southern 8 0Group Median 25% 75%northern 118.000 114.500 119.750 southern 117.500 116.000 120.500 T = 53.500 n(small)= 7 n(big)= 8 P(est.)= 0.817 P(exact)= 0.779 The differences in the median values among the two groups are not great enough to exclude the possibility that the difference is due to random sampling variability; there is not a statistically significant difference (P = 0.779)

Last updated on 27 September 2000.