Expert Work

The mean birth weight of all babies born in 2005 was 3,270 grams with a standard deviation of 610 grams. A random sample of 15 births to mothers who were less than 15 years of age results in a sample mean birth weight of 3,080 grams. Is there enough evidence to suggest that mothers less than 15 years of age have lower birth weight babies? Assume that σ = 610 grams and α = 0.10.
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