2 - STAT E-50 Introduction to Statistics Quantitative Data...

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Unformatted text preview: STAT E-50 - Introduction to Statistics Quantitative Data 1. Researchers have investigated lead absorption in children of parents who worked in a factory where lead is used to make batteries. Shown below are the levels of lead in the children’s blood (in μ g/dl of whole blood): 38 23 41 18 37 36 23 62 31 34 24 14 21 17 16 20 15 10 45 39 22 35 49 48 44 35 43 39 34 13 73 25 27 Source: D. Morton, et al., “Lead Absorption in Children of Employees in a Lead-Related Industry,” American Journal of Epidemiology 155 (1982). Who? What? 1. Researchers have investigated lead absorption in children of parents who worked in a factory where lead is used to make batteries. Shown below are the levels of lead in the children’s blood (in μ g/dl of whole blood): 38 23 41 18 37 36 23 62 31 34 24 14 21 17 16 20 15 10 45 39 22 35 49 48 44 35 43 39 34 13 73 25 27 Source: D. Morton, et al., “Lead Absorption in Children of Employees in a Lead-Related Industry,” American Journal of Epidemiology 155 (1982). Who? Children of parents who worked in a factory where lead is used What? Lead level, in μ g/dl of whole blood Page 2 1. Researchers have investigated lead absorption in children of parents who worked in a factory where lead is used to make batteries. Shown below are the levels of lead in the children’s blood (in μ g/dl of whole blood): 38 23 41 18 37 36 23 62 31 34 24 14 21 17 16 20 15 10 45 39 22 35 49 48 44 35 43 39 34 13 73 25 27 Source: D. Morton, et al., “Lead Absorption in Children of Employees in a Lead-Related Industry,” American Journal of Epidemiology 155 (1982). a) Construct a grouped frequency table , with the classes indicated: Lead Level Frequency 10 - 20 ///// // 7 20 - 30 ///// /// 8 30 - 40 ///// ///// 10 40 - 50 ///// / 6 50 - 60 60 - 70 / 1 70 - 80 / 1 33 9 Page 5 c) Describe the distribution in terms of mode? The data is unimodal; there is a mode at 30 - 40 symmetry? skewness? ┌─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤ frequency ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤ 12 ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤ 11 ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤ 10 ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤ 9 ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤ 8 ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤ 7 ├─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┼─┤...
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This note was uploaded on 05/20/2008 for the course STAT 50 taught by Professor Weinstein during the Spring '08 term at Harvard.

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2 - STAT E-50 Introduction to Statistics Quantitative Data...

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