82 CHAPTER 2 Exploring Data with Tables and Graphs 1. Email Data Listed below are the interarrival times (minutes) of email arriving at the author’s computer. Construct a frequency distribution. Use a class width of 10 minutes and begin with a lower class limit of 0 minutes. Compare the distribution of these interarrival times to the distribution of the commute times listed in the Chapter Problem (Table 2-1) and summarized in the frequency distribution of Table 2-2. 195839 361172113 120 11213 7 833 3 23418 1201618372515 1 1 629 5 5 3 7 9 7 5 638 19 637182453 141 2 6 9 935 110112815 818 2.Histogram of Interarrival Times Construct the histogram that corresponds to the frequency distribution from Exercise 1. Use class midpoint values for the horizontal scale. Does the histogram suggest that the data are from a population having a normal distribution? Why or why not? 3.Dotplot of Interarrival Times Construct a dotplot of the interarrival times listed in Exercise 1. Which does a better job of illustrating the distribution of the data: the histogram from Exercise 2 or the dotplot? 4.Stemplot of Interarrival Times Construct a stemplot of the interarrival times listed in Exercise 1. Are there any outliers? 5.Body Temperatures Listed below are the temperatures from nine males measured at 8 AM and again at 12 AM (from Data Set 5 “Body Temperatures” in Appendix B). Construct a scatterplot. Based on the graph, does there appear to be a relationship between 8 AM temperatures and 12 AM temperatures? 8 AM 98.0 97.0 98.6 97.4 97.4 98.2 98.2 96.6 97.4 12 AM 98.0 97.6 98.8 98.0 98.8 98.8 97.6 98.6 98.6 6. Environment a. After collecting the average (mean) global temperatures for each of the most recent 100 years, we want to construct the graph that is most appropriate for these data. Which graph is best? b. After collecting the average (mean) global temperature and the amount of carbon monoxide emissions for the most recent 100 years, we want to construct a graph to investigate the association between those two variables. Which graph is best? c. An investigation of carbon monoxide sources includes motor vehicles, furnaces, fires, coalburning power plants, and tobacco smoke. If we want to construct a graph that illustrates the relative importance of these sources, which graph is best? 7.It’s Like Time to Do This Exercise In a Marist survey of adults, these are the words or phrases that subjects find most annoying in conversation (along with their frequencies of response): like (127); just sayin’ (81); you know (104); whatever (219); obviously (35). Construct a pie chart. Identify one disadvantage of a pie chart. 8. Whatever Use the same data from Exercise 7 to construct a Pareto chart. Which graph does a better job of illustrating the data: Pareto chart or pie chart? Review Exercises
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