1 Review Exercises 30 CHAPTER 1 Introduction to Statistics Section 1.1 In Exercises 1–4, identify the population and the sample. Describe the sample data set. 1. A survey of 1025 U.S. adults found that they had visited the library an average of 10.5 times in the past 12 months. (Source: Gallup) 2. Eighty-three doctors working in the St. Louis area were surveyed concerning their opinions on health care reform. 3. In a survey of 23,503 U.S. adults, 59% said that if they were single, they would look up someone on the Internet before going on a date with them. (Source: YouGov) 4. A survey of 1508 U.S. adults ages 40–64 found that 32% had provided regular support to their parents in the past year. (Source: AARP) In Exercises 5–8, determine whether the number describes a population parameter or a sample statistic. Explain your reasoning. 5. In 2019, the United States imported more than $4.8 billion worth of personal protective equipment. (Source: Office of Textiles and Apparel) 6. In a survey of 1000 household food purchasers, 24.7% say that they avoid meat, dairy, and eggs produced by animals living in confined conditions. (Source: FoodPrint) 7. In a sample of 2061 U.S. workers, 39% say that they are engaged in their work. (Source: Gallup) 8. The students receiving bachelor of science degrees from a university include 52 biology majors. 9. Which part of the survey described in Exercise 3 represents the descriptive branch of statistics? Make an inference based on the results of the survey. 10. Which part of the survey described in Exercise 4 represents the descriptive branch of statistics? Make an inference based on the results of the survey. Section 1.2 In Exercises 11–14, determine whether the data are qualitative or quantitative. Explain your reasoning. 11. The ages of a sample of 350 employees of a software company 12. The zip codes of a sample of 200 customers at a sporting goods store 13. The revenues of the companies on the Fortune 500 list 14. The marital statuses of the employees of a casino In Exercises 15–18, determine the level of measurement of the data set. Explain. 15. The daily high temperatures (in degrees Fahrenheit) for Phoenix, Arizona, for a week in March are listed. (Source: NOAA) 89 87 80 70 69 59 61
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