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The weights of newborn children in the United States vary according to the normal distribution...

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The weights of newborn children in the United States vary according to the normal distribution with mean 7 5 pounds and standard deviation 1 25 pounds An article in the The Wall Street Journal claims that the average birth weight is decreasing over time Steady Decline Change in the average birth weight of babies born in the U S since 1990 in ounces 0 0 5 1 0 1 5 2 0 1990 95 00 Born between 37 and 41 weeks and not including multiple births Source Obstetrics and Gynecology www 05 A local hospital wanted to see if the claim was true and randomly sampled 16 baby s weights and found an average weight of 7 3 pounds Test the claim using a 1 level of significance that the mean weight significantly smaller than the national average of 7 5 pounds Use the population standard deviation of 1 25 pounds Give answer to at least 4 decimal places What are the correct hypotheses Select the correct symbols Ho M H pounds OB X OF

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