Reading ability and IQ. A study of reading ability in

Chapter , Problem 2.33

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Reading ability and IQ. A study of reading ability in schoolchildren chose 60 fifth-grade children at random from a school. The researchers had the childrens scores 0 10 20 40 50 30 Internet users per 100 people Births per 1000 people 0 10 20 30 40 50 60 70 80 90 FIGURE 2.11 Scatterplot of births (per 1000 people) versus Internet users (per 100 people) for 106 countries, for Exercise 2.28. BEER INBIRTH INBIRTH INBIRTH 2.2 Scatterplots 101 on an IQ test and on a test of reading ability.14 Figure 2.12 plots reading test score (response) against IQ score (explanatory). (a) Explain why we should expect a positive association between IQ and reading score for children in the same grade. Does the scatterplot show a positive association? (b) A group of four points appear to be outliers. In what way do these childrens IQ and reading scores deviate from the overall pattern? (c) Ignoring the outliers, is the association between IQ and reading score roughly linear? Is it very strong? Explain your answers.