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A random sample of 20 girls started walking at a mean age of 12.4 months with a standard deviation of 0.75 months. A sample of

A random sample of 20 girls started walking at a mean age of 12.4 months with a standard deviation of 0.75 months. A sample of 18 boys had a mean of 12 and a standard deviation of 0.65. Test the hypothesis at a 1% significance level.

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