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Heights of 9-Year-Olds At age 9 the average weight (21.3 kg) and the average height (124.5cm) for both boys and girls are exactly the same.

Heights of 9-Year-Olds At age 9 the average weight (21.3 kg) and the average height (124.5cm) for both boys and girls are exactly the same. A random sample of -year-olds yielded these results. At a=0.05, do the data support the given claim that there is a difference in heights?

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