In a comparison of the visual acuity of deaf and hearing children, eye movement rates are taken on 10 deaf and 10 hearing children. The data are shown in the accompanying table and saved in the EYEMOVE file. A clinical psychologist believes that deaf children have greater visual acuity than hearing children. (The larger a child's eye movement rate, the more visual acuity the child possesses.)

a. Use a nonparametric procedure to test the psychologist€™s claim at α = .05.
b. Conduct the test by using the large-sample approximation for the nonparametric test. Compare the results with those found in part a.

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Deaf Children Hearing Children 2.75 3.23 2.30 2.64 1.95 2.17 2.45 1.83 2.23 1.65 1.43 1.83 1.75 1.23 2.03 1.64 1.96 1.37