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AFDA – Unit 9: Stats and Surveys Day 7 Notes: Test Review Name: _________________ Block: _____ Date:_______ Match the word to the correct definition: _______1. Bias A. Sampling whatever is easiest and readily available _______2. Cluster Sampling B. Group of interest sharing similar characteristics _______3. Convenience Sampling C. Using a selected number or system to determine the other individual in a sample D. Subset of the population _______4. Population _______5. Sample _______6. Simple Random Sampling (SRS) E. Population divided into multiple groups, members within each group are randomly selected F. Sampling error that may yield inaccurate results _______7. Stratified Sampling G. Every possible sample of a given size has equal chance of being selected _______8. Systematic Sampling H. Population divided into multiple groups, entire groups randomly selected Directions: Read the scenario and then answer the questions. 9. A study of 33,043 infants in Italy was conducted to find a link between a heart rhythm abnormality and sudden infant death syndrome. a. What is the population of this study? b. What is the sample of the study? 10. Amanda wants to determine the favorite professional sport of the students in her high school. Which of the follow samples is most likely to give her a representative sample? a. b. c. d. A random sample of the students in the art honor society A random sample of students on the basketball team. A random sample of students on the official school enrollment roster A random sample of students in the library during lunch. Explain: 11. The student council also wants to plan lunchtime activities for Spirit Week, which precedes the homecoming dance. They decide to survey students to find out which activities might be the most popular. Which of the follow groups would give them the most representative survey sample? a. b. c. d. The freshmen, junior varsity, and varsity football teams. The dance team and the band. The speech club and the drama club One English class at each grade level. Explain: Directions: Identify which sampling technique is used in each study. Chose from the sampling techniques below and explain your reasoning. Simplified Random Sampling (SRS) Cluster Stratified Systematic Convenience 12. Dr. Noto randomly selects a group of 100 students using student IDs to be on a committee to review Flex guidelines. 13. The SCA chooses one English class from each grade level surveys every student in that class. 14. You want to know how much people are spending on Christmas shopping. You divide the population in Virginia into four age groups. You randomly select ten people from each age group. 15. Garrett is doing a survey about the senior exam exemption. He interviews the people sitting with him in the cafeteria. 16. Leah randomly picks one person to start surveying and then surveys every 5th person until she reaches a sample of 100. Directions: Consider the following scenarios and then answer the questions. 17. A researcher is studying the correlation between drinking milk and SAT scores. The researcher randomly selects 30 boys and 30 girls from across the state. The researcher then tracks the consumption of milk for year before each student takes the SAT. a. Is this an example of an experiment? Why or why not? b. State all the methods that were used to eliminate bias. c. What could the researcher add to the design to make this a better study? Directions: Identify which experimental design technique is used in each study. Choose from the following examples. Randomization Blocking Placebo Single Blind Double Blind 18. A researcher studying the effects of a medicine selects 50 patients to participate in a study. The researcher’s assistant then selects 25 patients who don’t receive treatment and 25 patients that will receive the treatment. The researcher assesses the progress of the patients after three weeks. 19. A researcher studying the effects of a medicine selects 30 patients who receive a water pill and 30 people who receive the actual treatment. The researcher assesses the progress of the patients after three weeks. 20. A researcher is studying the correlation between playing a high school sport and classroom grades. The researcher decides to survey students at Potomac Falls High School. The students are listed by gender and the researcher selects 30 random girls and 30 random boys to participate in the survey. (This one may have more than one answer)