13th Edition

ISBN: 9780134462455

Author: Mario F. Triola

Publisher: PEARSON

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Chapter 13.4, Problem 12BSC

Appendix B Data Sets. In Exercises 9–12, refer to the indicated data set in Appendix B and use the Wilcoxon rank-sum test.

12. IQ and Lead Exposure Data Set 7 “IQ and Lead” 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 of the performance IQ score than those with high lead levels. Does lead exposure appear to have an adverse effect?

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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Chapter 13.4, Problem 11BSC

Chapter 13.4, Problem 13BB

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Chapter 13 Solutions

Elementary Statistics (13th Edition)

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Solution Summary: The author explains the null hypothesis that the subjects with low and high lead levels have a higher median of the full IQ scores.

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