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lleIS A high school's studelit co. . . . newspaper plans to survey local businesses about the tion pg 208 importance of students as customers. From telephone for th book listings, the newspaper staff chooses 150 busi- 15, 1 nesses at random. Of these, 73 return the question- "Dor naire mailed by the staff. Identify the population and surve the sample. 8. Onli 2. Student archaeologists An archaeological dig turns the up large numbers of pottery shards, broken stone from tools, and other artifacts. Students working on the WWW aged project classify each artifact and assign it a number. issue The counts in different categories are important for else (859 understanding the site, so the project director chooses 2% of the artifacts at random and checks the students' (a) work. Identify the population and the sample.que 15 obta ( b ) 3. Sampling stuffed envelopes A large retailer prepares 85% its customers' monthly credit card bills using an of all automatic machine that folds the bills, stuffs them drivi into envelopes, and seals the envelopes for mailing. Are the envelopes completely sealed? Inspectors 9. Slee 40 velopes from the 1000 stuffed each studeYour SRS contains the students labeled (a) 14, 45, 92, 60, 56. (d) 14, 03, 10, 22, 06. (b) 14, 31, 03, 10, 22. (e) 14, 03, 10, 22, 1 1. (c) 14, 03, 10, 22, 22. 40. When we take a census, we attempt to collect data from (a) a stratified random sample. (b) every individual selected in an SRS. (c) every individual in the population. (d) a voluntary response sample. (e) a convenience sample.us little about the population of all adults. (d) the sample is too small to draw any conclusion. (e) None of these. 38. Archaeologists plan to examine a sample of 2-meter- square plots near an ancient Greek city for artifacts visible in the ground. They choose separate random samples of plots from floodplain, coast, foothills, and high hills. What kind of sample is this? (a) A cluster sample (b) A convenience sample (c) A simple random sample 43. (d) A stratified random sample (e) A voluntary response sample 39. Your statistics class has 30 students. You want to call an SRS of 5 students from your class to ask where they use a computer for the online exercises. You 01 02 30 Youframe. (c) interviewing people at shopping malls to obtain, sample. (d) variation due to chance in choosing a sample at random. (e) inability to contact many members of the sample 42. A simple random sample of 1200 adult Americans is selected, and each person is asked the following ques tion: "In light of the huge national deficit, should the government at this time spend additional money to establish a national system of health insurance?" Only 39% of those responding answered "Yes." This survey (a) is reasonably accurate since it used a large simple random sample. (b) needs to be larger since only about 24 people were drawn from each state. (c) probably understates the percent of people who favor a system of national health insurance. (d) is very inaccurate but neither understates nor overstates the percent of people who favor a system of national health insurance. Since simple random sampling was used, it is unbiased. (e) probably overstates the percent of people who favor a system of national health insurance. 43. Sleep debt (3.2) A researcher reported that the aver- age teenager needs 9.3 hours of sleep per night but gets only 6.3 hours.17 By the end of a 5-day school week, a teenager would accumulate about 15 hours of "sleep debt." Students in were skepticalHon Should female athletes be paid the same as men ephone for the work they do?" In all, 13,147 (44%) said "Yes," busi- 15,182 (50%) said "No," and the remaining 1448 said tion- "Don't know." In spite of the large sample size for this on and survey, we can't trust the result. Why not? 12. 8. Online polls In June 2008, Parade magazine posed turns the following question: "Should drivers be banned from using all cell phones?" Readers were encour- the www aged to vote online at parade.com. The July 13, 2008, iber. issue of Parade reported the results: 2407 t for (85%) said "Yes" and 410 (15%) said "No." E hooses to dents' (a) What type of sample did the Parade survey obtain? (b us (b) Explain why this sampling method is biased. Is epares Ashley 85% probably higher or lower than the true percent of all adults who believe that cell phone use while Bay Poin em driving should be banned? Why? Beau Jar Bluffs ling. 9. Sleepless nights How much sleep do high school Brandon hour students get on a typical school night? An interested Briarwood d the student designed a survey to find out. To make data Brownstor collection easier, the student surveyed the first 100 Burb students to arrive at school on ils