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A polling agency conducted a survey of 100 doctors on the question “Are you willing to treat women patients with the recently approved pill RU-486”. The conservative margin of error associated with the 95% confidence interval for the percent who say yes is?


* a) 50%
* b) 10%
* c) 5%
* d) 2%

Answer - b

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Scenario: A study was done to compare the lung capacity of coal miners to the lung capacity of farm workers. The researcher studied 200 workers of each type. Other factors that might affect lung capacity are smoking habits and exercise habits. The smoking habits of the two worker types are similar, but the coal miners generally exercise less than the farm workers do?Which one of these statistics is unaffected by outliers?