Chapter 14 Textbook Classwork

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Presentation transcript:

Chapter 14 Textbook Classwork AP Statistics Chapter 14 Textbook Classwork

Chapter 14 30. Polling, part II. According to Pew Research, the contact rate (probability of contacting a selected household) was 69% in 1997 and 76% in 2003. However, the cooperation rate (probability of someone at the contacted household agreeing to be interviewed) was 58% in 1997 and dropped to 38% in 2003. What is the probability (in 2003) of obtaining an interview with the next household on the sample list? (To obtain an interview, an interviewer must both contact the household and then get agreement for the interview.) Was it more likely to obtain an interview from a randomly selected household in 1997 or in 2003?

Among four potential donors, what is the probability that Chapter 14 Blood. The American Red Cross says that about 45% of the U.S. population has Type O blood, 40% Type A, 11% Type B, and the rest Type AB. Someone volunteers to give blood. What is the probability that this donor has Type AB blood? has Type A or Type B? is not Type O? Among four potential donors, what is the probability that all are Type O? no one is Type AB? they are not all Type A? at least one person is Type B?

Chapter 14 The train. To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day, but the commuter estimates he’ll get stopped on about 15% of work days. During a certain 5-day work week, what is the probability that he gets stopped on Monday and again on Tuesday? gets stopped for the first time on Thursday? gets stopped every day? gets stopped at least once during the week?

Chapter 14 Religion. Census reports for a city indicate that 62% of residents classify themselves as Christian, 12% as Jewish, and 16% as members of other religions (Muslims, Buddhists, etc.). The remaining residents classify themselves as nonreligious. A polling organization seeking information about public opinions wants to be sure to talk with people holding a variety of religious views, and makes random phone calls. Among the first four people they call, what is the probability they reach all Christians? no Jews? at least one person who is nonreligious?