Gesturing is common during human speech. Is this behavior learned via exposure? A measure was made of the number of gestures produced by each of 12 pairs of sighted individuals while talking to sighted individuals (Iverson and Goldin-Meadow 1998). This result was compared with the number of gestures produced while talking by each of 12 pairs of people who had been blind since birth and were therefore presumably unexposed to the gestures of others. The data are as follows:

Test the hypothesis that the number of gestures is related to sightedness, using a nonparametric test.

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Blind: 0,0, 1,1, 1,1, 2,2, 1,1, 1,1, 1,1, 3,3, 1,1,0,0, 1,1, 11 Sighted: 1,1,0,0, 1,1, 2,2, 3,3,0,0, 1,1, 2,2, 2,2,0,0, 3,3³, 11