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In the large city A, 20% of random sample of 900 school children had defective eye-sight. In the large city B, 15% of random sample

In the large city A, 20% of random sample of 900 school

children had defective eye-sight. In the large city B, 15% of random sample of

1600 school children had the same defect. Is this difference between the two

proportions significant? Obtain the 95% confidence limits of the difference in

the population proportions.

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