In a large city A, 20% of a random sample of 900 school boys had defective eye-sight. In another large city B, 18.5% of the random sample of 1600 school boys had the same defect. Is the difference between the two proportions significant?
In a large city A, 20% of a random sample of 900 school boys had defective eye-sight. In another large city B, 18.5% of the random sample of 1600 school boys had the same defect. Is the difference between the two proportions significant?