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Solved: efer to the indicated data set in Appendix B and
Chapter 13, Problem 10 BSC(choose chapter or problem)
Problem 10BSC
refer to the indicated data set in Appendix B and use the Wilcoxon rank-sum test.
IQ and Lead Exposure 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?
Questions & Answers
QUESTION:
Problem 10BSC
refer to the indicated data set in Appendix B and use the Wilcoxon rank-sum test.
IQ and Lead Exposure 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?
ANSWER:
Solution 10BSC
Critical values
As the test is a two tailed test and the significance level is 0.05, that is a = 0.05.
Thus the critical values are z = -1.96 , z = 1.96.
Which implies that t