PPT Slide
running a Mann-Whitney U-Test
development of manual dexterity in three-year-old children, time used for block-manipulation task by 5 boys and 8 girls:
girls: 37 56 39 34 26 104 48 25
stating the null hypothesis -- (H0) : there is no systematic difference between the solution times for boys and the times for girls
identify decision criteria -- for a non-directional test with a = 0.05 and with nA = 5 and nB = 8, the Mann-Whitney table gives a critical value of U = 6 (if the data produce U<=6, H0 will be rejected)
critical values for Mann-Whitney U for a=0.05, two-tailed