By Ann E. Watkins; Richard L. Scheaffer; George W. Cobb
*Statistics in motion displays the newest advancements in facts and employs smooth, powerful the way to train this more and more vital subject. * vital innovations, real-world context- scholars will discover ways to behavior, randomize and study surveys and experiments.
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Extra resources for Statistics in Action: Understanding a World of Data, 2nd Edition
Sample text
That is, why does the distribution have the shape it does? E16. Suppose you collect this information for each student in your class: age, hair color, number of siblings, gender, and miles he or she lives from school. What are the cases? What are the variables? Classify each variable as quantitative or categorical. 36 Age of pennies. Each dot represents four points. 2 Graphical Displays of Distributions 53 E17. 37. E20. 38 into a relative frequency histogram. I. scores on a fairly easy examination in statistics II.
24. Discoveries like this demonstrate why you should always plot your data. 25 Dot plot of the speeds of mammals. When are dot plots most useful? 1, a dot plot shows shape, center, and spread. Dot plots tend to work best when • you have a relatively small number of values to plot • you want to see individual values, at least approximately • you want to see the shape of the distribution • you have one group or a small number of groups you want to compare Histograms Histograms show groups of cases as bars.
Describe the distribution you see here. How does the distribution of female education compare to the distribution of male education? Why is it better to look at relative frequency bar charts rather than frequency bar charts to make this comparison? 35 The male labor force age 25 years and older by educational attainment. S. ] P13. 1 on page 5, make a bar chart showing the number of workers laid off in each round. In addition to a bar showing layoffs, for each of the five rounds, include a bar showing the number of workers not laid off .