Outliers in scatterplots may be within the range of values for each variable individually but lie outside the general pattern when the variables are examined in combination. A few points in Figures 10.9 and 10.10 could be considered as outliers. In the context of this example, explain the characteristics of someone who appears as an outlier.
Answer to relevant QuestionsIn Chapter 9, we examined a picture of winning time in men’s 500meter speed skating plotted across time. The data represented in the plot started in 1924 and went through 2010. A regression equation relating winning time ...Refer to the previous exercise about the relationship between mothers’ and daughters’ heights. Would the intercept of the regression line relating x = Mother’s height to y = Daughter’s height have a useful ...Suppose a study measured total beer sales and number of highway deaths for 1 month in various cities. Explain why it would make sense to divide both variables by the population of the city before determining whether a ...Construct an example for which correlation between two variables is masked by grouping over a third variable. News Story 20: “Eating Organic Foods Reduces Pesticide Concentrations in Children.” Exercises 30 and 31 list the titles of some of the news stories printed or summarized in the Appendix. In each case, determine whether ...
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