12:06 PM Mon Oct 24 1 18% TO O + In each of the following situations, a sample is chosen from a population. Identify the population as precisely as possible. . An opinion poll contacts 972 American adults and asks them "Would you rather have a job working for the government or working for business?" . A computer manufacturer receives a large shipment of hard drives from a supplier. From this shipment, 10 drives are selected and tested. If any are defective, the shipment is sent back. . A Wayne State administrator wonders whether students are satisfied with the quality of the recreational facilities on campus. She randomly selects 200 undergraduates and sends them a questionnaire. gist is interested in determining what proportion of teens believe the drinking age should be lowered to 18. She selects a sample of five high schools in a large city and interviews all twelfth-graders in each of the schools. Identify each of the following as a voluntary response sample or a convenience sample. In each case, identify one way in which the sample will tend to be different from the population which it is supposed to represent. 5. A professor wants to know about the drinking habits of college students. He requires the students in his freshmen seminar class to fill out a survey. 6. You are on vacation, and making plans for dinner. Earlier you noticed a restaurant near your hotel. You decide to read the reviews on Yelp (a website where people can post reviews of businesses). Most of the reviews are negative. TURN OVER A researcher wants to know if eating oatmeal reduces the level of bad cholesterol (LDL). She finds two groups of 500 people. One group regularly eats oatmeal, the other does not. She measures the bad cholesterol (LDL) for each group and compares them. 7. This is not an experiment. Explain why not. 8. How could this study be changed to make it an experiment? 9. What are the individuals? 10. There are two variables that are recorded for each individual considered. What are they? Are they numeric or not? Can pleasant aromas help people work more efficiently? Researchers did a study to find out. Twenty-two undergraduate psychology students each worked six paper-and-pencil mazes. The researchers randomly assigned the students to one of two groups. One group of students wore a mask with floral scents. The other group wore a mask with no scent. The researchers found that the subjects wearing the scented mask took less time to complete the mazes. 11. Is this an experiment or an observational study? 12. How do you know? 13. Which statement best represents the conclusion the researchers hope to draw? a. "Pleasant aromas help undergraduate psychology students work more efficiently." b. "Pleasant aromas help colle work more efficiently." c. "Pleasant aromas help people work more efficiently." 14. Based on your answer to the previous question, what are the individuals? 15. There are two variables that are recorded for each individual considered. What are they? Are they numeric or not ? A computer manufacturer receives large shipments of hard drives from a supplier. From each sent back. shipment, 10 hard drives are selected and tested. If any are defective, the entire shipment is 16. Is this an experiment or an observational study? WIN 17. How do you know? 18. What are the individuals?