In 2003 th Journal of the American medical Association reported a study examining the possible impact of air pollution caused by 9/11 attack on New York’s World Trade center on the weight of babies. Researchers found that 8% of 182 babies born to mothers who were exposed to heavy doses of soot and ash on September 11th were classified as low birth weight. Only 4% of 2300 babies born in another New York city hospital whose mothers had not been near the site were similarly classified. Does this indicate strong evidence that air pollution is linked to a higher proportion of low weight babies? Test at the 0.05 level.
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