In 1975 the journal Environmental News reported that a number of communities in Boston showed elevated...

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In 1975 the journal Environmental News reported that a number ofcommunities in Boston showed elevated levels of lead in thedrinking water supplies. Water testing was done on a random sampleof 248 households in these areas of Boston and results showed that20% of the households had lead levels that were above the U.S.Public Health Service standard of 50 ppm. A nearby area that usedanti-corrosives in its water supply as a preventative measure toreduce the leaching of lead from pipes into the water showed that5% of 100 randomly selected households had lead levels in excess ofthe standard. Explain the approach you would use to evaluatewhether there appeared to be an association (or difference inelevated lead levels) for the two communities. You don't have to dothe calculation but must:
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specify the null and alternative hypothesis
describe the statistical test or approach you would use
justify why you would use that test/approach.
identify the page in the text (or presentation & slidenumber) that contains the relevant equations.

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3.6 Ratings (604 Votes)

Null Hypothesis H0 The true proportion of the households inBoston that had lead levels in excess of the standard is equal tothe true proportion of the households in nearby area that had leadlevels in excess of the standardAlternative See Answer

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