Question: Data Set 5 in Appendix B lists performance IQ scores for a random sample of subjects with low lead levels in their blood and another

Data Set 5 in Appendix B lists performance IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood. Use a 0.05 significance level to test the claim that subjects with low lead levels have a higher median performance IQ score than those with high lead levels. Does lead exposure appear to have an adverse effect?

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R 1 4178 R 2 772 R 7878211 2 3900 R Test statistic z 4178 3900 116833 238 Critical values z 1645 ... View full answer

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