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CLASS ACTIVITIES FOR CHAPTER 2 Descriptive Statistics Activity 1 In 1997 there were 11,012 licensed drivers over age 55 involved in fatal crashes. There were only 7670 licensed drivers between the ages of 16 and 20 involved in fatal crashes. Does this establish that younger drivers are better and safer than older drivers? Why? Activity 2 - Shark Attacks Around the World A sensational news item of recent years has been shark attacks. In the United States, shark attacks most commonly occur in Florida. There were 289 reported shark attacks in Florida between 1990 and 2002. The International Shark Attack File (ISAF) provides data on shark attacks. Table 1 classifies 735 shark attacks reported from 1990 through 2002, listing countries where attacks occurred as well as the 3 states in the US where shark attacks were most common. Table 1: Frequency of Shark Attacks in Various Regions of the World for 1990-2002. Region Frequency Region Frequency Region Frequency Florida 289 Hawaii 44 California 34 Australia 44 Brazil 55 South Africa 64 Reunion Island 12 New Zealand 17 Japan 10 Hong Kong 6 Other 160 (a) What regions of the world besides Florida have experienced shark attacks and how many occur in each region? 1
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(b) What is the variable? Is it qualitative or quantitative? (c) Identify the mode of the distribution. Activity 3 - Source of Energy On August 14, 2003, a major power outage hit the NorthEastern United States and parts of Canada. This major blackout brought attention to our dependence on energy and to the diminishing stockpile of natural resources. As the worldwide demand for energy increases, conservation and alternative sources of energy be- come more important. The so-called renewable energy sources produce electricity without depleting natural resources. Coal and natural gas are significant fossil fuel contributors to the emission of carbon dioxide, which is a form of air pollution and may lead to climate change. Hydropower is a renewable source. The “other” sources refers to renewable sources (solar power, wind power, which have received attention as energy sources that are less environmentally damaging. (a) Portray the information provided by the data with a pie chart and a bar chart using R. (b) What percentage of electricity come from renewable energy sources (hydropower or other) in both countries. Comment! (c) Which of the pie chart and the bar chart do you prefer when it comes to comparing Canada and the US? Table 2: Sources of Electricity in the US and Canada, and the Percentage of Electricity Use Generated by Each Source US Percentage Canada Percentage Coal 51 16 Hydropower 6 65 Natural Gas 16 1 Nuclear 21 16 Petroleum 3 1 Other 3 1 Activity 4 - Hazardousness of Sports The following table lists estimates of the number of sports-related injuries treated in U.S. hospital emergency departments in 1997, along with an estimate of the number of participants in the sports taken from Injury Facts, National Safety Council, 1999.
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This note was uploaded on 10/01/2009 for the course CHEM 334 taught by Professor Lei during the Spring '09 term at UConn.

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