8. Heights of 9-Year-Olds At age 9 the average weight (21.3 kg) and the average height (124.5 cm) for both boys and girls are exactly the same. A random sample of 9-year-olds yielded these results. Estimate the mean difference in height between boys and girls with 95% confidence. Does your interval support the given claim? Вoys Girls Sample size Mean height, cm Population variance 60 50 123.5 126.2 98 120 Source: www.healthepic.com

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