Conduct a non directional test of no difference

Reference no: EM131852707

We wish to know whether supplementing the diet with extra quantities of vitamin A makes a difference in ability to see under conditions of dim illumination. We randomly assign 20 subjects to one of two groups, and feed one group a normal diet and the other a normal diet plus supplementary vitamin A. After 1 week under this regimen, each individual is tested for visual acuity in conditions of dim illumination. The following visual acuity scores are obtained.

918_visual acuity in conditions.png

(a) State formally the hypotheses necessary to conduct a non directional test of no difference between the two population means.

(b) Complete the test at the .05 level of significance, and state your conclusions.

(d) Compute the estimated effect size, g, and r.

Reference no: EM131852707

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