15.9 Eye Movement In an investigation of the visual scanning behaviour of deaf children, measurements of eye movement were taken on nine deaf and nine hearing children. The table gives the eye-movement rates and their ranks (in parentheses). Does it appear that the distributions of eye-movement rates for deaf children and hearing children differ?

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Deaf Children Hearing Children 2.75 (15) 0.89 (1) 2.14 (11) 1.43 (7) 3.23 (18) 1.06 (4) 2.07 (10) 1.01 (3) 2.49 (14) 0.94 (2) 2.18 (12) 1.79 (8) 3.16 (17) 1.12 (5.5) 2.93 (16) 2.01 (9) 2.20 (13) 1.12 (5.5) Rank sum 126 45