(1) EpiInfo output for the data set TWOGRPS.REC
Output:
MEANS of SCORE for each category of GROUP
GROUP Obs Total Mean Variance Std Dev
1 10 933 93.300 220.678 14.855
2 10 1076 107.600 236.267 15.371
Difference -14.300
GROUP Minimum 25%ile Median 75%ile Maximum Mode
1 72.000 86.000 95.000 97.000 125.000 95.000
2 89.000 93.000 105.500 126.000 130.000 89.000
ANOVA
Variation SS df MS F statistic p-value t-value
Between 1022.450 1 1022.450 4.475 0.048594 2.115458
Within 4112.500 18 228.472
Total 5134.950 19
Bartlett's test for homogeneity of variance
Bartlett's chi square = 0.010 deg freedom = 1 p-value = 0.920626
Mann-Whitney or Wilcoxon Two-Sample Test (Kruskal-Wallis test for two groups)
Kruskal-Wallis H (equivalent to Chi square) = 3.301
Degrees of freedom = 1
p value = 0.069223