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Texas A&M University, Corpus Christi *

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1442

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Mathematics

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Feb 20, 2024

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Math 1442 (Statistics for Life) Ch 1 Sec 1.1 Section 1.1 Statistical and Critical Thinking DEFINITIONS 1
Math 1442 (Statistics for Life) Ch 1 Sec 1.1 Example 2: Identify the population and the sample in the following study. A study of the dietary habits of 20,000 men was conducted to find a link between high intakes of dairy products and prostate cancer. Example 3: Would you collect data using a population (a census) or a sample (a sampling) to determine the following? Why? a) The most popular sports team among people in New York. b) The average salary of the 30 employees of a company. c) Whether wedding guests are allergic to the planned main course. d) Amount of time high school students spend on their cell phones each week. Example 4: Determine if each of the following is a population parameter or a sample statistic. a) A survey of 1000 U.S. adults found that 40% think that the Internet is the best way to get news and information. b) At a college, 90% of the members of the Board of Trustees approved the contract of the new president. c) A survey of 733 small business owners found that 17% have a current job opening. 2
Math 1442 (Statistics for Life) Ch 1 Sec 1.1 d) The 2182 students who accepted admission offers to Northwestern University in 2009 have an average SAT score of 1442. (Source: Northwestern University) Example 5: In a recent survey, 1500 adults in the United States were asked if they thought there was solid evidence for global warming. Eight hundred fifty-five of the adults said yes. (Adapted from: Pew Research Center). Identify the population and the sample. Describe the data set The Process of Statistical Study: Prepare → Analyze → Conclude (P.A.C.) Voluntary Response Sample (or Self-Selected Sample): one in which the respondents themselves decide whether to be included. Example: Internet polls, in which people online can decide whether to respond : Mail-in polls, in which people can decide whether to reply : Telephone call-in polls, in which newspaper, radio, or television announcements ask that you voluntarily call a special number to register your opinion 3
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